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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Pretax total $ (143) $ 14 $ 6
Unrealized Gains (Losses) on Debt Securities      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net realized (losses) gains on sales of debt securities (137) 20 15
Change in unrealized gains (losses) on debt securities for which credit-related portion was recognized in earnings     (7)
Pretax total (137) 20 8
Tax effect 35 (5) (2)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Pretax total [1] (6) (6) (2)
Tax effect [1] 2 2 1
Amortization of net actuarial loss [1] $ (6) (7) (5)
Amortization of prior service credit [1]   $ 1 $ 3
[1] Amounts are components of net periodic cost. See Note 16 Employee Benefit Plans for additional details.