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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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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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