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Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 17,359  
Ending Balance 18,621  
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,848) $ (3,159)
Other comprehensive income (loss) before reclassifications 106 531
Amounts reclassified to the statements of income 7 (80)
Net other comprehensive income (loss) before tax 113 451
Corresponding income tax   (6)
Net other comprehensive income (loss) after tax 113 445
Ending Balance (1,735) (2,714)
Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (91) (81)
Other comprehensive income (loss) before reclassifications   (9)
Amounts reclassified to the statements of income   1
Net other comprehensive income (loss) before tax   (8)
Corresponding income tax   (5)
Net other comprehensive income (loss) after tax   (13)
Ending Balance (91) (94)
Derivative Financial Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (442) (302)
Other comprehensive income (loss) before reclassifications (51) 2
Amounts reclassified to the statements of income 7 6
Net other comprehensive income (loss) before tax (44) 8
Net other comprehensive income (loss) after tax (44) 8
Ending Balance (486) (294)
Available-for-sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 1 (7)
Other comprehensive income (loss) before reclassifications 1 90
Amounts reclassified to the statements of income   (35)
Net other comprehensive income (loss) before tax 1 55
Corresponding income tax   (1)
Net other comprehensive income (loss) after tax 1 54
Ending Balance 2 47
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,316) (2,769)
Other comprehensive income (loss) before reclassifications 156 448
Amounts reclassified to the statements of income   (52)
Net other comprehensive income (loss) before tax 156 396
Net other comprehensive income (loss) after tax 156 396
Ending Balance $ (1,160) $ (2,373)