Consolidated Variable Interest Entities - Number of FG VIE's Consolidated (Details)	12 Months Ended
	Dec. 31, 2014 Entity		Dec. 31, 2013 Entity		Dec. 31, 2012 Entity
Number of FG VIEs Consolidated [Roll Forward]
Number of FG VIE's matured	(2)
Variable Interest Entity, Primary Beneficiary [Member]
Number of FG VIEs Consolidated [Roll Forward]
Number of FG VIE's consolidated, beginning of period	40		33		33
Number of FG VIE's consolidated	2	[1]	11	[1]	2	[1]
Number of FG VIE's deconsolidated	(8)	[1]	(3)	[1]	0	[1]
Number of FG VIE's matured	(2)		(1)		(2)
Number of FG VIE's consolidated, end of period	32		40		33

[1] (1)Net gain on deconsolidation was $120 million and net loss on consolidation was $26 million in 2014. Net loss on consolidation and deconsolidation was $7 million in 2013 and $6 million in 2012, respectively, and recorded in “fair value gains (losses) on FG VIEs” in the consolidated statement of operations.