Other Financial Statement Details Interest and Other, Net (Details) - USD ($) $ in Millions  | 
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017  | 
Oct. 01, 2016  | 
Sep. 30, 2017  | 
Oct. 01, 2016  | 
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| Other Nonoperating Income (Expense) [Abstract] | ||||
| Interest income | $ 137 | $ 56 | $ 349 | $ 159 | 
| Interest expense | (191) | (180) | (493) | (575) | 
| Other, net | 23 | (8) | 480 | 76 | 
| Total interest and other, net | (31) | (132) | 336 | (340) | 
| Interest Costs Capitalized | $ 77 | $ 36 | $ 212 | $ 82 | 
| X | ||||||||||
- Definition Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
- References No definition available. 
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