Employee Benefits - Retirement Plan, Based on Measurement Date (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in Plan Assets:
Fair value of assets at end of year	$ 228
Pension Benefits
Change in Benefit Obligation:
Benefit obligation at beginning of year	158	$ 172
Interest cost	4	4	$ 5
Actuarial gain	(38)	(9)
Annuity payments	(7)	(6)
Settlements	(1)	(3)
Benefit obligation at end of year	116	158	172
Change in Plan Assets:
Fair value of assets at beginning of year	283	261
Actual return (loss) on plan assets	(47)	31
Annuity payments	(7)	(6)
Settlements	(1)	(3)
Fair value of assets at end of year	228	283	$ 261
Funded status (included in “Other assets”)	112	125
Changes recognized in other comprehensive income for the year ended December 31:
Amortization of actuarial loss	(2)	(7)
Net actuarial (gain) loss arising during the year	26	(23)
Total recognized in other comprehensive income for the year (pre-tax)	24	(30)
Accumulated other comprehensive (gain) loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:
Actuarial (gain) loss, net	66	43
Total accumulated other comprehensive loss (pre-tax)	$ 66	$ 43