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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, 2020	Dec. 31, 2019
Liabilities
Long-term debt	$ 8,855	$ 6,042
Level 2
Debt, Long-term and Short-term, Combined Amount [Abstract]
Long-term debt, including current portion	9,446	6,388
Level 3
Debt, Long-term and Short-term, Combined Amount [Abstract]
Long-term debt, including current portion	0	116
Carrying Amount
Assets
Notes receivable	2	11
Liabilities
Long-term debt	8,781	5,956
Fair Value
Assets
Notes receivable	2	8
Liabilities
Long-term debt	$ 9,446	$ 6,504

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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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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Amount, before allowance for credit loss, of financing receivable.

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