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Recent Accounting Pronouncements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Recent Accounting Pronouncements        
Retained earnings $ 7,289 $ 6,381    
Accumulated other comprehensive income, net of tax 595 1,194    
Total equity 9,232 9,712 9,694 9,950
Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts | Restatement for new accounting standard
       
Recent Accounting Pronouncements        
Retained earnings     (1,400)  
Accumulated other comprehensive income, net of tax     113  
Total equity     $ (1,300)