Principles of Consolidation and Other Matters Investment Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Trident II [Member]
Deferred Revenue Arrangement [Line Items]
Equity method income		$ 20
Trident III [Member] | Performance Fees [Member]
Deferred Revenue Arrangement [Line Items]
Recognized deferred performance fees	7	15
Deferred performance fees	35
Private Equity Funds [Member] | Trident III [Member]
Deferred Revenue Arrangement [Line Items]
Unrealized Gain (Loss) on Investments	$ 6