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Equity - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (2,312)    
Ending Balance (2,399) $ (2,312)  
Foreign Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1,794) (1,878) $ (1,139)
Other comprehensive income/(loss) before reclassifications (190) 100 (729)
Net other comprehensive income (loss) before tax (190) 100 (729)
Corresponding income tax 65 (16) (10)
Net other comprehensive income (loss) after tax [1] (125) 84 (739)
Ending Balance (1,919) (1,794) (1,878)
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   1 (4)
Cumulative effect of new accounting standard [2]     5
Other comprehensive income/(loss) before reclassifications   (1) (1)
Amounts reclassified to the statements of income     1
Net other comprehensive income (loss) before tax   (1)  
Net other comprehensive income (loss) after tax [1]   (1)  
Ending Balance     1
Derivative Financial Instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (420) (504) (619)
Other comprehensive income/(loss) before reclassifications 22 54 87
Amounts reclassified to the statements of income 35 30 28
Net other comprehensive income (loss) before tax 57 84 115
Net other comprehensive income (loss) after tax [1] 57 84 115
Ending Balance (363) (420) (504)
Benefit Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (98) (78) (91)
Other comprehensive income/(loss) before reclassifications (7) (11) 4
Amounts reclassified to the statements of income (12) (10) 13
Net other comprehensive income (loss) before tax (19) (21) 17
Corresponding income tax 1 1 (4)
Net other comprehensive income (loss) after tax [1] (18) (20) 13
Ending Balance (117) (98) (78)
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (2,312) (2,459) (1,853)
Cumulative effect of new accounting standard [2]     5
Other comprehensive income/(loss) before reclassifications (175) 142 (639)
Amounts reclassified to the statements of income 23 20 42
Net other comprehensive income (loss) before tax (152) 162 (597)
Corresponding income tax 66 (15) (14)
Net other comprehensive income (loss) after tax [1] (86) 147 (611)
Ending Balance $ (2,399) $ (2,312) $ (2,459)
[1] Amounts do not include foreign currency translation adjustments attributable to non-controlling interests of $56 million gain in 2020, $14 million gain in 2019 and $26 million gain in 2018.
[2] Following the adoption of ASU 2016-01, the Company recorded a $ 5 million opening balance reclassification from accumulated other comprehensive income to retained earnings.