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Investments Investments (Details 6) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Investments in limited partnerships        
Equity in earnings of limited partnerships $ 34 $ 37 $ 111 $ 112
Indemnity
       
Investments in limited partnerships        
Equity in earnings of limited partnerships 4 5 13 13
Indemnity | Equity method of accounting
       
Investments in limited partnerships        
Equity in earnings of limited partnerships 3 5 10 12
Indemnity | Fair value option
       
Investments in limited partnerships        
Equity in earnings of limited partnerships 1 0 3 1
Exchange
       
Investments in limited partnerships        
Equity in earnings of limited partnerships 30 32 98 99
Exchange | Equity method of accounting
       
Investments in limited partnerships        
Equity in earnings of limited partnerships 26 29 83 89
Exchange | Fair value option
       
Investments in limited partnerships        
Equity in earnings of limited partnerships $ 4 $ 3 $ 15 $ 10