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Fair Value of Financial Instruments - Estimated Carrying Amounts and Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, including current portion	$ 5,929	$ 6,042
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	10	11
Long-term debt, including current portion	5,854	5,956
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	7	8
Long-term debt, including current portion	6,309	6,504
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, including current portion	6,305	6,388
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, including current portion	$ 4	$ 116

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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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