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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications $ (160) $ 108 $ 156
Reclassifications out of AOCI (14) (6) (4)
Tax effect 42 (21) (33)
Total other comprehensive (loss) income, net of tax (132) 81 119
Unrealized Gains (Losses) on Debt Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications (169) 125 168
Reclassifications out of AOCI (20) (8) (4)
Tax effect 46 (29) (39)
Total other comprehensive (loss) income, net of tax (143) 88 125
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications (2) 14 15
Reclassifications out of AOCI 0 0 0
Tax effect 1 0 (1)
Total other comprehensive (loss) income, net of tax (1) 14 14
Pension Benefit Adjustment      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications 11 (31) (27)
Reclassifications out of AOCI 6 2 0
Tax effect (5) 8 7
Total other comprehensive (loss) income, net of tax $ 12 $ (21) $ (20)