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Debt And Related Expenses (Schedule of Net Financing Cost Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Disclosure [Abstract] |  |  |  |
Interest based on debt outstanding | $ 93 | $ 65 | $ 296 | $ 195
Gain on early retirement of debt |  |  | (30) |
Interest income | (1) | (5) | (2) | (12)
Other | (6) | 6 | (21) | 17
Total net financing costs | $ 86 | $ 66 | $ 243 | $ 200

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