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Variable Interest Entities ("VIE's") (Consolidated Variable Interest Entity Settlement Payments and Mark-to-Market Adjustments) (Details) - Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Consolidated Variable Interest Entity Settlement Payments And Mark To Market Adjustments [Line Items]        
Gains (losses) for consolidated variable interest entities [1]       $ 5
Credit default swaps [Member]        
Consolidated Variable Interest Entity Settlement Payments And Mark To Market Adjustments [Line Items]        
Gains (losses) for consolidated variable interest entities       5
Contingent forwards [Member]        
Consolidated Variable Interest Entity Settlement Payments And Mark To Market Adjustments [Line Items]        
Gains (losses) for consolidated variable interest entities
[1] Reported in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).