Stock Compensation Plans - Purchased Restricted Stock Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
PRSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of vested	$ 38
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted	$ 67
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted, weighted average period, in years	1 year 11 months 8 days
Purchased Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued Shares (in shares)	0	43,690	61,870
Aggregate Purchases	$ 0	$ 6	$ 9
Covered shares (in shares)	0	21,845	30,935
Total fair value of vested	$ 3
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted	$ 1
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted, weighted average period, in years	1 year 21 days