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Debt Fair Value of Debt Instruments (Details) - USD ($) $ in Billions	Mar. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Fair value of debt excluding finance leases	$ 25.0	$ 27.7
Book value of debt excluding finance leases	$ 22.9	$ 23.1

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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