Consolidated Variable Interest Entities - Number of FG VIE's Consolidated (Details) - Variable Interest Entity, Primary Beneficiary [Member] - Entity		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Number of FG VIEs Consolidated [Roll Forward]
Number of FG VIE's consolidated, beginning of period		34	32
Number of FG VIE's, Radian Asset acquisition		0	4
Number of FG VIE's consolidated	[1]	1	1
Number of FG VIE's deconsolidated	[1]	(2)	0
Number of FG VIE's, matured		(1)	0
Number of FG VIE's consolidated, end of period		32	37

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