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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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