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Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI roll forward    
Beginning balance $ 7,454 $ 7,070
Other comprehensive income (loss), net of tax 9 (83)
Ending balance 7,429 6,745
Accumulated Other Comprehensive Income (Loss) [Member]    
AOCI roll forward    
Beginning balance 39 (8)
Other comprehensive income (loss) before reclassifications, net of tax 8  
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 1  
Other comprehensive income (loss), net of tax 9 (83)
Ending balance 48 $ (91)
Derivative Instruments [Member]    
AOCI roll forward    
Beginning balance (9)  
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 1  
Other comprehensive income (loss), net of tax 1  
Ending balance (8)  
Available for Sale Securities [Member]    
AOCI roll forward    
Beginning balance 49  
Other comprehensive income (loss) before reclassifications, net of tax (5)  
Other comprehensive income (loss), net of tax (5)  
Ending balance 44  
Foreign Currency Translation Adjustments [Member]    
AOCI roll forward    
Beginning balance (1)  
Other comprehensive income (loss) before reclassifications, net of tax 13  
Other comprehensive income (loss), net of tax 13  
Ending balance $ 12