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Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Cash | $ 208 | $ 153
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, fair value | 2,032 | 2,323
Total cash and cash equivalents | 2,032 | 2,323
U.S. and Canadian government obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 1,488 | 1,902
Cash equivalents, fair value | 1,488 | 1,902
Other debt obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 336 | 268
Cash equivalents, fair value | 336 | 268
Nonqualified employee benefit trusts |  |
Cash and Cash Equivalents [Abstract] |  |
Available-for-sale securities, amortized cost | 16 | 16
Unrealized Gains | 1 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 17 | $ 16

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