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Recent Accounting Standards Recent Accounting Standards (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  | $ 342
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | 176
PSE And G [Member] | Accounting Standard Update 2017-07 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | $ 15 |  | $ 44 |  |
Prior Period Reclassification Adjustment |  |  | $ (2) |  | $ (5) |
Power [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ 175
Power [Member] | Accounting Standard Update 2017-07 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | 2 |  | 6 |
Operating Revenues [Member] | PSE And G [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | (21) |  | (60) |
Operating Revenues [Member] | Power [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | (27) |  | (53) |
Energy Costs [Member] | PSE And G [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | (8) |  | (33) |
Operation and Maintenance Expense [Member] | PSE And G [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ (13) |  | $ (27) |
Maximum [Member] | Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 300 |  |  |  |  |
Maximum [Member] | Subsequent Event [Member] | PSE And G [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 100 |  |  |  |  |
Maximum [Member] | Subsequent Event [Member] | Power [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 60 |  |  |  |  |

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