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Commitments and Contingencies (MHI Claims) (Details) - USD ($) | 1 Months Ended
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Mar. 31, 2017 | Apr. 30, 2016 | Oct. 31, 2013 | Jun. 30, 2010
Southern California Edison |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |
Damages sought |  |  |  | $ 112,000,000
Initial recovery rewarded |  | $ 124,000,000 |  |
San Onofre | Southern California Edison | Mitsubishi Heavy Industries Ltd |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |
Initial recovery rewarded | $ 52,000,000 |  |  |
Net recovery | $ 47,000,000 |  |  |
San Onofre | Southern California Edison | Mitsubishi Heavy Industries Ltd | Minimum |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |
Damages sought |  |  | $ 4,000,000,000 |
San Onofre | Mitsubishi Heavy Industries Ltd |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |
Asserted counterclaim |  |  | $ 41,000,000 |

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