Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
---|---|---|
Reported Value Measurement | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Long-term debt, including current portion | $ 7,782 | $ 7,048 |
Estimate of Fair Value Measurement | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Long-term debt, including current portion | 7,997 | 7,020 |
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Long-term debt, including current portion | 2,159 | 1,905 |
Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Long-term debt, including current portion | $ 5,838 | $ 5,115 |