Debt Fair Value of Debt Instruments (Details) - USD ($) $ in Billions	Sep. 30, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Fair value of debt excluding finance leases	$ 21.0	$ 27.7
Book value of debt excluding finance leases	$ 23.2	$ 23.1

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Period Type:	instant