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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, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	$ 2	$ 2
Long-term debt, including current portion	8,537	8,781
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	2	2
Long-term debt, including current portion	$ 8,897	$ 9,446

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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