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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Change in fair value of available-for-sale securities, income tax | $ 0 | $ 0 | $ (3)
Available-for-sale securities, reclassification to earnings, income tax | 0 | 0 | 0
Foreign currency translation adjustments, income tax | 0 | (18) | 11
Foreign currency, reclassification to earnings, income tax | 0 | 0 | 0
Change in derivative fair value, income tax | (35) | (108) | (56)
Derivative reclassification to earnings, income tax | (56) | (22) | (41)
Pension, prior service cost for the period, income tax | 0 | 0 | 0
Pension, net actuarial gain (loss) for the period, income tax | (300) | (117) | (57)
Pension, amortization of net actuarial loss, income tax | (15) | (6) | (12)
Parent Company |  |  |
Change in fair value of available-for-sale securities, income tax | 0 | 0 | (3)
Available-for-sale securities, reclassification to earnings, income tax | 0 | 0 | 0
Foreign currency translation adjustments, income tax | 0 | (18) | 11
Foreign currency, reclassification to earnings, income tax | 0 | 0 | 0
Change in derivative fair value, income tax | (33) | (95) | (37)
Derivative reclassification to earnings, income tax | (51) | (21) | (20)
Pension, prior service cost for the period, income tax | 64 | 25 | 23
Pension, amortization of net actuarial loss, income tax | $ (5) | $ (1) | $ (12)

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