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Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Cash	$ 52	$ 108
Cash and Cash Equivalents
Cash equivalents:
Cost Basis	757	683
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	757	683
U.S. and Canadian government obligations | Cash and Cash Equivalents
Cash equivalents:
Cost Basis	649	552
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	649	552
Other debt securities | Cash and Cash Equivalents
Cash equivalents:
Cost Basis	56	23
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	56	23
Nonqualified employee benefit trusts
Cash equivalents:
Cost Basis	17	16
Unrealized Gains	3	3
Unrealized Losses	0	0
Fair Value	$ 20	$ 19

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