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Debt (Estimated Fair Value of Significant Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt $ 1,191 $ 17
Long-term debt 10,552 10,933
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt 1,195 17
Long-term debt $ 11,004 $ 12,466