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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |
Reclassification of ATM credit carryforwards | $ 573 |  |
Provisional adjustments for TCJA | 3 | $ 76 | $ 73
Regulatory liability representing revaluation of deferred tax balances | $ 57 |  |

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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense + References No definition available. + Details
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- Definition Provisional Income Tax Expense (Benefit) associated with the Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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