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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) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax expense at statutory rates $ (460) $ (305) $ (305)
Tax benefit from tax exempt income 97 84 74
Foreign taxes and credits (1) (13) (3)
Taxes related to domestic affiliate       (21)
Prior year tax adjustment       20
Other tax expense (12) (10) (7)
Income tax (expense) benefit $ (376) $ (244) $ (242)