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Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Cash | $ 168 | $ 208
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, fair value | 1,614 | 2,032
Total cash and cash equivalents | 1,614 | 2,032
U.S. and Canadian government obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 932 | 1,488
Cash equivalents, fair value | 932 | 1,488
Other debt obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 514 | 336
Cash equivalents, fair value | 514 | 336
Nonqualified employee benefit trusts |  |
Cash and Cash Equivalents [Abstract] |  |
Available-for-sale securities, amortized cost | 15 | 16
Unrealized Gains | 2 | 1
Unrealized Losses | 0 | 0
Fair Value | $ 17 | $ 17

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