Retirement Plans and Profit Sharing Arrangements - Pension Plan Assets Measured at Fair Value on a Recurring Basis (Details) - Pension Plans - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	$ 1,292	$ 1,142	$ 1,583
Level 1
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	180	156
Level 2
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	7	6
Level 3
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	23	19
U.S. small cap stocks | Total, Level 1, 2 and 3
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	97	82
U.S. small cap stocks | Level 1
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	90	76
U.S. small cap stocks | Level 2
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	7	6
U.S. small cap stocks | Level 3
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	0	0
Registered investment companies | Total, Level 1, 2 and 3
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	90	80
Registered investment companies | Level 1
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	90	80
Registered investment companies | Level 2
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	0	0
Registered investment companies | Level 3
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	0	0
Insurance contracts | Total, Level 1, 2 and 3
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	23	19
Insurance contracts | Level 1
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	0	0
Insurance contracts | Level 2
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	0	0
Insurance contracts | Level 3
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	23	19
Cash equivalents | NAV
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	3	6
Collective investment funds | NAV
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	859	758
Real estate investment trusts | NAV
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	28	29
Hedge funds | NAV
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	24	16
Pooled pension funds at NAV | NAV
Pension plan assets measured at fair value on a recurring basis:
Fair value of plan assets	$ 168	$ 152