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Income Taxes - Reconciliation to Nominal Tax Rate (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of total taxes to nominal federal rate details [Abstract]      
Nominal federal income tax rate 35.00%    
Tax expense at nominal rate $ 761 $ 867 $ 657
Tax advantaged investments (30) (31) (33)
Effect of indefinitely reinvested foreign earnings (42) (37) (17)
Resolution of federal tax matters (18) 0 (30)
State income tax (net of federal income tax benefit) 27 28 14
Other    26 24
Total taxes $ 698 $ 853 $ 615