Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive Income (Loss), Accumulated Other Comprehensive Income (Loss) (Detail)

v3.8.0.1
Other Comprehensive Income (Loss), Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive income (loss) before reclassifications1     $ 3,336    
Amounts reclassified out of accumulated other comprehensive income $ (942) $ (27) (1,437) $ (450)  
Tax effects     (395)    
Other comprehensive income (loss) 436 480 1,504 340  
Unrealized holding gains (losses) on available-for-sale investments [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) 2,572   2,572   $ 2,164
Other comprehensive income (loss) before reclassifications1     2,589    
Amounts reclassified out of accumulated other comprehensive income     (1,962)    
Tax effects     (219)    
Other comprehensive income (loss)     408    
Unrealized holding gains (losses) on derivatives [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) 91   91   (259)
Other comprehensive income (loss) before reclassifications1     528    
Amounts reclassified out of accumulated other comprehensive income     (28)    
Tax effects     (150)    
Other comprehensive income (loss)     350    
Prior service credits (costs) [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) (48)   (48)   (40)
Other comprehensive income (loss) before reclassifications1     0    
Amounts reclassified out of accumulated other comprehensive income 3 2 (9) 6  
Tax effects     1    
Other comprehensive income (loss)     (8)    
Actuarial gains (losses) [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) (999)   (999)   (1,240)
Other comprehensive income (loss) before reclassifications1     213    
Amounts reclassified out of accumulated other comprehensive income 15 $ 20 55 $ 46  
Tax effects     (27)    
Other comprehensive income (loss)     241    
Foreign currency translation adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) (6)   (6)   (519)
Other comprehensive income (loss) before reclassifications1     6    
Amounts reclassified out of accumulated other comprehensive income     507    
Tax effects     0    
Other comprehensive income (loss)     513    
Accumulated other comprehensive income (loss) [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) $ 1,610   $ 1,610   $ 106