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Debt (Estimated Fair Value of Significant Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt $ 1,311 $ 17
Long-term debt 10,487 10,933
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt 1,312 17
Long-term debt $ 10,195 $ 12,466