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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