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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Pretax total		$ 14	$ 6	$ 4
Unrealized Gains (Losses) on Debt Securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on sales of debt securities		20	15	4
Change in unrealized gains (losses) on debt securities for which credit-related portion was recognized in earnings			(7)
Pretax total		20	8	4
Tax effect		(5)	(2)	(1)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Pretax total	[1]	(6)	(2)
Tax effect	[1]	2	1
Amortization of net actuarial loss	[1]	(7)	(5)	(4)
Amortization of prior service credit	[1]	$ 1	$ 3	$ 4
[1] Amounts are components of net periodic cost.  See Note 17 Employee Benefit Plans for additional details.

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