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Stock Based Compensation (Accrual Adjustments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement [Abstract] |  |  |
Compensation Costs included in O&M Expense | $ 35 | $ 33 | $ 30
Income Tax Benefit Recognized in Consolidated Statement of Operations | 10 | 9 | 9
Excess Tax Benefits | $ 2 | $ 5 | $ 3

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