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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net gain (loss) arising during the period, tax | $ 32 | $ (14) | $ (22)
Amortization of net (gain) loss included in net income (loss), tax | (2) | 5 | 4
Net prior service cost (credit) arising during the period, tax | 1 | 0 | (4)
Amortization of prior service cost (credit) included in net income (loss), tax | 2 | 0 | 0
Unrealized holding gain (loss) arising during the period, tax | (15) | (7) | 37
Reclassification adjustments included in net income (loss), tax | 37 | (25) | (96)
Southern California Edison |  |  |
Net gain (loss) arising during the period, tax | (6) | (2) | (6)
Amortization of net (gain) loss included in net income (loss), tax | $ 3 | $ 2 | $ 2

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