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Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI roll forward      
Beginning balance $ 7,070 $ 6,276 $ 6,042
Other comprehensive income (loss), net of tax 47 79 (90)
Ending balance 7,454 7,070 6,276
Accumulated Other Comprehensive Income (Loss) [Member]      
AOCI roll forward      
Beginning balance (8) (87) 8
Other comprehensive income (loss) before reclassifications, net of tax 41 72 (98)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 6 7 8
Other comprehensive income (loss), net of tax 47 79 (90)
Ending balance 39 (8) (87)
Accumulated Other Comprehensive Income (Loss) [Member] | Accounting Standards Update 2018-02 [Member]      
AOCI roll forward      
Adoption of new accounting standard     (5)
Derivative Instruments [Member]      
AOCI roll forward      
Beginning balance (24) (32) (33)
Other comprehensive income (loss) before reclassifications, net of tax 7    
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax 8 8 8
Other comprehensive income (loss), net of tax 15 8 8
Ending balance (9) (24) (32)
Derivative Instruments [Member] | Accounting Standards Update 2018-02 [Member]      
AOCI roll forward      
Adoption of new accounting standard     (7)
Available for sale Securities [Member]      
AOCI roll forward      
Beginning balance 38 23 15
Other comprehensive income (loss) before reclassifications, net of tax 12 15 5
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (1)    
Other comprehensive income (loss), net of tax 11 15 5
Ending balance 49 38 23
Available for sale Securities [Member] | Accounting Standards Update 2018-02 [Member]      
AOCI roll forward      
Adoption of new accounting standard     3
Foreign Currency Translation Adjustments [Member]      
AOCI roll forward      
Beginning balance (21) (76) 29
Other comprehensive income (loss) before reclassifications, net of tax 20 55 (105)
Other comprehensive income (loss), net of tax 20 55 (105)
Ending balance (1) (21) (76)
Post - Retirement Benefit Obligation [Member]      
AOCI roll forward      
Beginning balance (1) (2) (3)
Other comprehensive income (loss) before reclassifications, net of tax 2 2 2
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (1) (1)  
Other comprehensive income (loss), net of tax $ 1 1 2
Ending balance   $ (1) (2)
Post - Retirement Benefit Obligation [Member] | Accounting Standards Update 2018-02 [Member]      
AOCI roll forward      
Adoption of new accounting standard     $ (1)