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Debt And Related Expenses (Schedule of Net Financing Cost Components) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Debt Disclosure [Abstract] |  |
Interest based on debt outstanding | $ 92 | $ 105
Early retirement of debt |  | (20)
Interest income | (1) | (1)
Other | (6) | 7
Total net financing costs | $ 85 | $ 77

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