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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Income taxes    
Net deferred tax liability, consolidated $ 269  
Net deferred income tax asset 43 37
Net deferred income tax liability 312 365
Deferred tax asset valuation allowance 0  
Indemnity
   
Income taxes    
Net deferred income tax asset 43 37
Net deferred income tax liability 0 0
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%  
Exchange
   
Income taxes    
Net deferred income tax asset 0 0
Net deferred income tax liability $ 312 $ 365
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%  
Minimum | Indemnity
   
Income taxes    
Percent of total permanent tax differences related to investment revenues (as a percent) 98.00%  
Minimum | Exchange
   
Income taxes    
Percent of total permanent tax differences related to investment revenues (as a percent) 98.00%