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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Income taxes    
Net deferred tax liability, consolidated $ 351  
Net deferred tax asset 16 19
Net deferred tax liability 367 147
Percent of total permanent tax differences related to investment revenues (as a percent) 98.00%  
Indemnity
   
Income taxes    
Net deferred tax asset 16 19
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%  
Exchange
   
Income taxes    
Net deferred tax liability $ 367 $ 147
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%