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Debt (Estimated Fair Value Of Significant Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt $ 1,215 $ 314
Long-term debt 10,741 5,510
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt 1,229 313
Long-term debt $ 11,953 $ 5,437