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Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI roll forward        
Beginning balance $ 7,429 $ 6,745 $ 7,454 $ 7,070
Other comprehensive income (loss), net of tax 22 50 31 (33)
Ending balance 7,354 6,893 7,354 6,893
Accumulated Other Comprehensive Income (Loss) [Member]        
AOCI roll forward        
Beginning balance 48 (91) 39 (8)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit     24  
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit     7  
Other comprehensive income (loss), net of tax 22 50 31 (33)
Ending balance 70 $ (41) 70 $ (41)
Derivative Instruments [Member]        
AOCI roll forward        
Beginning balance     (9)  
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit     7  
Other comprehensive income (loss), net of tax     7  
Ending balance (2)   (2)  
Available for Sale Securities [Member]        
AOCI roll forward        
Beginning balance     49  
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit     (2)  
Other comprehensive income (loss), net of tax     (2)  
Ending balance 47   47  
Foreign Currency Translation Adjustments [Member]        
AOCI roll forward        
Beginning balance     (1)  
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit     26  
Other comprehensive income (loss), net of tax     26  
Ending balance $ 25   $ 25