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Debt And Related Expenses (Schedule of Net Financing Cost Components) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Disclosure [Abstract]        
Interest based on debt outstanding $ 65 $ 68 $ 130 $ 151
Early retirement of debt       312
Other 1 (4) (4) (10)
Total net financing costs $ 66 $ 64 $ 126 $ 453