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Income Taxes (Provision For Income Taxes Using Federal Statutory Rate) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Income tax provision at federal statutory rate $ 782 $ 612 $ 561
States, net of federal benefit and Puerto Rico 35 31 29
Tax exempt investment income (25) (24) (21)
Nondeductible executive compensation 11 13 0
Contingent tax benefits 0 0 (17)
Other, net 13 18 10
Provision for income taxes $ 816 $ 650 $ 562