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Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, including current portion | $ 6,797 | $ 6,858
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, including current portion | 6,873 | 6,957
Level 2 | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, including current portion | 1,874 | 1,736
Level 3 | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, including current portion | $ 4,999 | $ 5,221

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- Definition Amount of long-term debt and lease obligation, including portion classified as current. + References No definition available. + Details
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