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Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Cash | $ 153 | $ 121
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, fair value | 2,323 | 1,628
Total cash and cash equivalents | 2,323 | 1,628
U.S. and Canadian government obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 1,902 | 1,452
Cash equivalents, fair value | 1,902 | 1,452
Other debt obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 268 | 55
Cash equivalents, fair value | 268 | 55
Nonqualified employee benefit trusts |  |
Cash and Cash Equivalents [Abstract] |  |
Available-for-sale securities, amortized cost | 16 | 17
Unrealized Gains | 0 | 3
Unrealized Losses | 0 | 0
Fair Value | $ 16 | $ 20

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