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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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