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Fair Value of Financial Instruments - Estimated Carrying Amounts of Fair Value of Financial Instruments not Carried at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Liabilities
Long-term debt	$ 8,100	$ 8,855
Carrying Amount
Liabilities
Long-term debt	8,040	8,781
Fair Value
Liabilities
Long-term debt	$ 8,327	$ 9,446

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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