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Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Cash | $ 121 | $ 108
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, fair value | 1,628 | 683
Total cash and cash equivalents | 1,628 | 683
U.S. and Canadian government obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 1,452 | 552
Cash equivalents, fair value | 1,452 | 552
Other debt obligations |  |
Cash and Cash Equivalents [Abstract] |  |
Cash and cash equivalents, adjusted cost | 55 | 23
Cash equivalents, fair value | 55 | 23
Nonqualified employee benefit trusts |  |
Cash and Cash Equivalents [Abstract] |  |
Available-for-sale securities, amortized cost | 17 | 16
Unrealized Gains | 3 | 3
Unrealized Losses | 0 | 0
Fair Value | $ 20 | $ 19

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