Consolidated Variable Interest Entities - Number of FG VIE's Consolidated (Details) - Variable Interest Entity, Primary Beneficiary [Member] - Entity		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Number of FG VIEs Consolidated [Roll Forward]
Number of FG VIE's consolidated, beginning of period		34	32
Number of FG VIE's consolidated	[1]	0	1
Number of FG VIE's deconsolidated	[1]	(1)	0
Number of FG VIE's consolidated, end of period		33	33

[1] Net loss on deconsolidation was de minimis in First Quarter 2016, and net loss on consolidation was $26 million in First Quarter 2015, and recorded in “fair value gains (losses) on FG VIEs” in the consolidated statement of operations.