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Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 17,359  
Ending Balance 17,938  
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,316) $ (2,769)
Other comprehensive income (loss) before reclassifications (495) 856
Amounts reclassified to the statements of income   (52)
Net other comprehensive income (loss) before tax (495) 804
Net other comprehensive income (loss) after tax (495) 804
Ending Balance (1,811) (1,965)
Available-for-sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 1 (7)
Other comprehensive income (loss) before reclassifications   76
Amounts reclassified to the statements of income (1) (44)
Net other comprehensive income (loss) before tax (1) 32
Corresponding income tax   5
Net other comprehensive income (loss) after tax (1) 37
Ending Balance   30
Derivative Financial Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (442) (302)
Other comprehensive income (loss) before reclassifications 42 (82)
Amounts reclassified to the statements of income 14 13
Net other comprehensive income (loss) before tax 56 (69)
Net other comprehensive income (loss) after tax 56 (69)
Ending Balance (386) (371)
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 1
Net other comprehensive income (loss) before tax 1 (8)
Corresponding income tax (2) (5)
Net other comprehensive income (loss) after tax (1) (13)
Ending Balance (92) (94)
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1,848) (3,159)
Other comprehensive income (loss) before reclassifications (453) 841
Amounts reclassified to the statements of income 14 (82)
Net other comprehensive income (loss) before tax (439) 759
Corresponding income tax (2)  
Net other comprehensive income (loss) after tax (441) 759
Ending Balance $ (2,289) $ (2,400)