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Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 17,359  
Ending Balance 17,730  
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,316) $ (2,769)
Other comprehensive income (loss) before reclassifications (562) 1,124
Amounts reclassified to the statements of income   (52)
Net other comprehensive income (loss) before tax (562) 1,072
Net other comprehensive income (loss) after tax (562) 1,072
Ending Balance (1,878) (1,697)
Available-for-sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 1 (7)
Other comprehensive income (loss) before reclassifications   56
Amounts reclassified to the statements of income   (41)
Net other comprehensive income (loss) before tax   15
Corresponding income tax   5
Net other comprehensive income (loss) after tax   20
Ending Balance 1 13
Derivative Financial Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (442) (302)
Other comprehensive income (loss) before reclassifications 54 (138)
Amounts reclassified to the statements of income 21 20
Net other comprehensive income (loss) before tax 75 (118)
Net other comprehensive income (loss) after tax 75 (118)
Ending Balance (367) (420)
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 2 2
Net other comprehensive income (loss) before tax 2 (7)
Corresponding income tax (2) (5)
Net other comprehensive income (loss) after tax   (12)
Ending Balance (91) (93)
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,848) (3,159)
Other comprehensive income (loss) before reclassifications (508) 1,033
Amounts reclassified to the statements of income 23 (71)
Net other comprehensive income (loss) before tax (485) 962
Corresponding income tax (2)  
Net other comprehensive income (loss) after tax (487) 962
Ending Balance $ (2,335) $ (2,197)