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v3.24.1.u1

Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Cash | $ 190 | $ 208
Cash and Cash Equivalents |  |
Cash equivalents: |  |
Cost Basis | 1,773 | 2,032
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 1,773 | 2,032
U.S. and Canadian government obligations | Cash and Cash Equivalents |  |
Cash equivalents: |  |
Cost Basis | 1,277 | 1,488
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 1,277 | 1,488
Other debt securities | Cash and Cash Equivalents |  |
Cash equivalents: |  |
Cost Basis | 306 | 336
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 306 | 336
Nonqualified employee benefit trusts |  |
Cash equivalents: |  |
Cost Basis | 16 | 16
Unrealized Gains | 1 | 1
Unrealized Losses | 0 | 0
Fair Value | $ 17 | $ 17

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