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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 |

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