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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Disclosure [Abstract]        
Interest based on debt outstanding $ 65 $ 65 $ 130 $ 130
Interest income (2) (7) (7) (18)
Other 6 8 11 14
Total net financing costs $ 69 $ 66 $ 134 $ 126