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Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Cash | $ 207 | $ 121
Cash and Cash Equivalents |  |
Cash equivalents: |  |
Cost Basis | 2,617 | 1,628
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 2,617 | 1,628
U.S. and Canadian government obligations | Cash and Cash Equivalents |  |
Cash equivalents: |  |
Cost Basis | 2,324 | 1,452
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 2,324 | 1,452
Other debt securities | Cash and Cash Equivalents |  |
Cash equivalents: |  |
Cost Basis | 86 | 55
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 86 | 55
Nonqualified employee benefit trusts |  |
Cash equivalents: |  |
Cost Basis | 17 | 17
Unrealized Gains | 2 | 3
Unrealized Losses | 0 | 0
Fair Value | $ 19 | $ 20

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