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Borrowings (Detail) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||
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Dec. 31, 2011
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Dec. 25, 2010
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Dec. 31, 2011
2005 Junior Subordinated Convertible Debentures Due 2035 At 2.95% [Member]
Days
Years
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Dec. 25, 2010
2005 Junior Subordinated Convertible Debentures Due 2035 At 2.95% [Member]
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Dec. 16, 2005
2005 Junior Subordinated Convertible Debentures Due 2035 At 2.95% [Member]
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Dec. 31, 2011
2009 Junior Subordinated Convertible Debentures Due 2039 At 3.25% [Member]
Days
Years
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Dec. 25, 2010
2009 Junior Subordinated Convertible Debentures Due 2039 At 3.25% [Member]
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Jul. 27, 2009
2009 Junior Subordinated Convertible Debentures Due 2039 At 3.25% [Member]
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Sep. 19, 2011
2011 Senior Notes [Member]
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Dec. 31, 2011
2011 Senior Notes Due October 1, 2016 At 1.95% [Member]
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Dec. 31, 2011
2011 Senior Notes Due October 1, 2021 At 3.30% [Member]
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Dec. 31, 2011
2011 Senior Notes Due October 1, 2041 At 4.80% [Member]
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Dec. 31, 2011
2007 Arizona Bonds Due 2037 At 5.3% [Member]
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Dec. 25, 2010
2007 Arizona Bonds Due 2037 At 5.3% [Member]
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Dec. 06, 2007
2007 Arizona Bonds Due 2037 At 5.3% [Member]
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| Debt Instrument [Line Items] | |||||||||||||||
| Debt Instrument, Maturity Date | Dec. 15, 2035 | Aug. 01, 2039 | Oct. 01, 2016 | Oct. 01, 2021 | Oct. 01, 2041 | Dec. 01, 2037 | |||||||||
| Debt Instrument, Face Amount | $ 1,600,000,000 | $ 2,000,000,000 | $ 5,000,000,000 | $ 125,000,000 | |||||||||||
| Net debt carrying amount | 919,000,000 | 908,000,000 | 1,052,000,000 | 1,041,000,000 | 1,498,000,000 | 1,995,000,000 | 1,489,000,000 | 131,000,000 | 128,000,000 | ||||||
| Annual coupon interest rate | 2.95% | 3.25% | 1.95% | 3.30% | 4.80% | 5.30% | |||||||||
| Principal Amount Per Debenture Used In Conversion Rate | 1,000 | 1,000 | |||||||||||||
| Conversion rate (shares of common stock per $1,000 principal amount of debentures) | 32.94 | 32.52 | 44.55 | 44.09 | |||||||||||
| Effective conversion price (per share of common stock) | $ 30.36 | $ 30.75 | $ 22.45 | $ 22.68 | |||||||||||
| Conversion Rate Adjustments, Quarterly Dividend Distributions Excess Per Share | $ 0.10 | $ 0.14 | |||||||||||||
| Annual effective interest rate | 6.45% | 7.20% | |||||||||||||
| Maximum Amount Of Contingent Interest That Will Accrue Per Year (in decimal ratio) | 0.40% | 0.50% | |||||||||||||
| Embedded Derivative, Fair Value of Embedded Derivative Liability | 19,000,000 | 10,000,000 | 12,000,000 | ||||||||||||
| Debt Instrument, Call Date, Earliest | Jan. 01, 2012 | ||||||||||||||
| Company Stock As Percentage Of Conversion Price, Surrender For Conversion | 130.00% | ||||||||||||||
| Company Stock As Percentage Of Conversion Price, Redemption Of Principal | 130.00% | 150.00% | |||||||||||||
| Trading Days During 30 Day Period In Which Company Stock Has Been At Least 130% Of Conversion Price, Surrender for Conversion | 20 | ||||||||||||||
| Trading Day Period Ending On Last Day Of Preceeding Fiscal Quarter, Surrender for Conversion | 30 | ||||||||||||||
| Trading Days During 30 Day Period In Which Company Stock Has Been At Least 130% Of Conversion Price, Redemption Of Principal | 20 | ||||||||||||||
| Trading Days During 30 Day Period In Which Company Stock Has Been At Least 150% Of Conversion Price, Redemption Of Principal | 20 | ||||||||||||||
| Trading Day Period Prior To Notice of Redemption Date, Redemption Of Principal | 30 | 30 | |||||||||||||
| Outstanding principal | 8,725,000,000 | 1,600,000,000 | 1,600,000,000 | 2,000,000,000 | 2,000,000,000 | ||||||||||
| Equity component carrying amount | 466,000,000 | 466,000,000 | 613,000,000 | 613,000,000 | |||||||||||
| Unamortized discount | 669,000,000 | 680,000,000 | 933,000,000 | 943,000,000 | |||||||||||
| Debt Instrument, Convertible, Remaining Discount Amortization Period (in years) | 24 | 28 | |||||||||||||
| Total long-term debt | 7,084,000,000 | 2,077,000,000 | |||||||||||||
| Year Payable, 2016 | 1,500,000,000 | ||||||||||||||
| Year Payable, 2017 and thereafter | 7,225,000,000 | ||||||||||||||
| Maximum Borrowings, Commercial Paper Program | 1,400,000,000 | 150,000,000 | |||||||||||||
| Bank Overdrafts | 47,000,000 | 38,000,000 | |||||||||||||
| Board Of Directors Maximum Borrowing Capacity Authorization | 3,000,000,000 | ||||||||||||||
| Commercial Paper | $ 200,000,000 | ||||||||||||||