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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
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)