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Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |  |  |  |
Balance at the beginning of period |  |  |  | $ (87) |  |
Net current-period other comprehensive loss | 5 |  | (38) | 5 |  | (17)
Balance at the end of period | (82) |  |  | (82) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |  |  |  |
Tax expense | (102) |  | 100 | (4) |  | 192
Total reclassification, net of tax | (70) |  | 98 | 227 |  | 208
Southern California Edison |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |  |  |  |
Balance at the beginning of period |  |  |  | (29) |  |
Net current-period other comprehensive loss | 2 |  | (3) | (1) |  | 0
Balance at the end of period | (30) |  |  | (30) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |  |  |  |
Tax expense | (99) |  | 108 | 13 |  | 208
Total reclassification, net of tax | (67) |  | 214 | 216 |  | 414
Accumulated Defined Benefit Plans Adjustment |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |  |  |  |
Balance at the beginning of period | (87) |  |  | (87) |  |
Other comprehensive loss before reclassifications | 0 |  |  | (2) |  |
Amounts reclassified from accumulated other comprehensive loss | 5 | [1] |  | 7 | [1] |
Net current-period other comprehensive loss | 5 |  |  | 5 |  |
Balance at the end of period | (82) |  |  | (82) |  |
Accumulated Defined Benefit Plans Adjustment | Southern California Edison |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Loss |  |  |  |  |  |
Balance at the beginning of period | (32) |  |  | (29) |  |
Other comprehensive loss before reclassifications | 0 |  |  | (4) |  |
Amounts reclassified from accumulated other comprehensive loss | 2 | [1] |  | 3 | [1] |
Net current-period other comprehensive loss | 2 |  |  | (1) |  |
Balance at the end of period | (30) |  |  | (30) |  |
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Loss |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |  |  |  |
Amortization of net loss included in net income | 6 |  |  | 9 |  |
Tax expense | 1 |  |  | 2 |  |
Total reclassification, net of tax | 5 |  |  | 7 |  |
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Loss | Southern California Edison |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Abstract] |  |  |  |  |  |
Amortization of net loss included in net income | 3 |  |  | 5 |  |
Tax expense | 1 |  |  | 2 |  |
Total reclassification, net of tax | $ 2 |  |  | $ 3 |  |
[1] | These items are included in the computation of net periodic pension and PBOP expense. See Note 8 for additional information.

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