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Other Intangible Assets Schedule of Other Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Amortization of deferred acquisition costs $ 328 $ 295
Amortization of Intangible Assets     
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 7  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 2  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 2  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 2  
Hardy [Member]
    
Amortization of deferred acquisition costs 21  
Other Intangible Assets [Member] | Hardy [Member]
    
Amortization of deferred acquisition costs 9  
Amortization expense included in other operating expenses $ 3