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Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Cash	$ 629	$ 168
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, fair value	1,982	1,614
Total cash and cash equivalents	1,982	1,614
U.S. and Canadian government obligations
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, adjusted cost	284	932
Cash equivalents, fair value	284	932
Other debt obligations
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, adjusted cost	1,069	514
Cash equivalents, fair value	1,069	514
Nonqualified employee benefit trusts
Cash and Cash Equivalents [Abstract]
Available-for-sale securities, amortized cost	15	15
Unrealized Gains	3	2
Unrealized Losses	0	0
Fair Value	$ 18	$ 17

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