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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications $ (1,168) $ (160) $ 108
Reclassifications out of AOCI 143 (14) (6)
Tax effect 249 42 (21)
Total other comprehensive (loss) income, net of tax (776) (132) 81
Unrealized Gains (Losses) on Debt Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications (1,182) (169) 125
Reclassifications out of AOCI 137 (20) (8)
Tax effect 264 46 (29)
Total other comprehensive (loss) income, net of tax (781) (143) 88
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications (43) (2) 14
Reclassifications out of AOCI 0 0 0
Tax effect 1 1 0
Total other comprehensive (loss) income, net of tax (42) (1) 14
Pension Benefit Adjustment      
Accumulated Other Comprehensive Income Loss [Line Items]      
Pretax change before reclassifications 57 11 (31)
Reclassifications out of AOCI 6 6 2
Tax effect (16) (5) 8
Total other comprehensive (loss) income, net of tax $ 47 $ 12 $ (21)