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Income Taxes (Reconciliation between the Company's federal income tax (expense) benefit at statutory rates and the recorded income tax (expense) benefit, excluding taxes on discontinued operations) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income tax expense at statutory rates $ (305) $ (305) $ (389)
Tax benefit from tax exempt income 84 74 84
Foreign taxes and credits (13) (3) (25)
Taxes related to domestic affiliate    (21) (1)
Prior year tax adjustment    20   
Other tax expense (10) (7) (1)
Income tax (expense) benefit $ (244) $ (242) $ (332)