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Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Cash	$ 208	$ 153
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, fair value	2,032	2,323
Total cash and cash equivalents	2,032	2,323
U.S. and Canadian government obligations
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, adjusted cost	1,488	1,902
Cash equivalents, fair value	1,488	1,902
Other debt obligations
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents, adjusted cost	336	268
Cash equivalents, fair value	336	268
Nonqualified employee benefit trusts
Cash and Cash Equivalents [Abstract]
Available-for-sale securities, amortized cost	16	16
Unrealized Gains	1	0
Unrealized Losses	0	0
Fair Value	$ 17	$ 16

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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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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