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Principles Of Consolidation And Other Matters Investment Income (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Trident II [Member]
Sep. 30, 2012
Trident II [Member]
Sep. 30, 2013
Trident II [Member]
Sep. 30, 2012
Trident II [Member]
Mar. 31, 2013
Trident II [Member]
Performance Fees [Member]
Sep. 30, 2013
Trident III [Member]
Performance Fees [Member]
Sep. 30, 2013
Trident III [Member]
Performance Fees [Member]
Deferred Revenue Arrangement [Line Items]              
Equity method income $ 0 $ (1,000,000) $ 20,000,000 $ 23,000,000      
Recognized deferred performance fees         15,000,000 13,000,000 34,000,000
Deferred performance fees           $ 43,000,000 $ 43,000,000