Accumulated Other Comprehensive Income (Loss) (AOCI) (Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), net of tax, Beginning Balance			$ (92)
Change in unrealized gains (losses) on debt securities			(1,206)
Change in foreign currency translation adjustment			(59)
Amortization of net actuarial loss			4
Tax effect	$ 91	$ 14	305	$ 33
Accumulated other comprehensive income (loss), net of tax, Ending Balance	(1,048)		(1,048)
Unrealized Gains (Losses) on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Beginning Balance			29
Change in unrealized gains (losses) on debt securities			(1,206)
Tax effect	90	15	304	34
Accumulated other comprehensive income (loss), debt securities, available-for-sale, adjustment, after tax, Ending Balance	(873)		(873)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Beginning Balance			(39)
Change in foreign currency translation adjustment			(59)
Tax effect	1	$ 0	1	$ 0
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax, Ending Balance	(97)		(97)
Pension Benefit Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Beginning Balance			(82)
Amortization of net actuarial loss			4
Tax effect			0
Accumulated other comprehensive (income) Loss, defined benefit plan, after Tax, Ending Balance	$ (78)		$ (78)