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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net gain (loss) arising during the period, tax | $ 13 | $ 30 | $ (9)
Net prior service cost (credit) arising during the period, tax | 0 | 3 | 0
Unrealized holding gain (loss) arising during the period, tax | 0 | 15 | 7
Reclassification adjustments included in net income (loss), tax | 0 | 37 | (25)
Comprehensive Income Other Adjustment, Tax | 1 |  |
Southern California Edison |  |  |
Net gain (loss) arising during the period, tax | 9 | (3) | 1
Comprehensive Income Other Adjustment, Tax | $ 1 |  |

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