Insurance Company Regulatory Requirements (Tables)

12 Months Ended

Dec. 31, 2017

Insurance Company Regulatory Requirements [Abstract]

Schedule of Statutory Capital and Surplus and Net Income

Insurance Regulatory Amounts Reported

	Policyholders' Surplus				Net Income (Loss)
	As of December 31,				Year Ended December 31,
	2017		2016		2017		2016		2015
	(in millions)
U.S. statutory companies:
AGM(1)	$	2,254	$	2,321	$	152	$	191	$	217
AGC(1)(2)	2,073		1,896		219		108		(92		)
MAC	270		487		32		142		102
Bermuda statutory company:
AG Re	1,294		1,255		156		139		51

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(1) Policyholders' surplus of AGM and AGC include their indirect share of MAC. AGM and AGC own approximately 61% and 39%, respectively, of the outstanding stock of Municipal Assurance Holdings Inc. (MAC Holdings), which owns 100% of the outstanding common stock of MAC.

(2) As indicated in Note 2, Acquisitions, AGC completed the acquisition of MBIA UK (now AGLN) on January 10, 2017, CIFGH (the parent company of CIFGNA) on July 1, 2016 and Radian Asset on April 1, 2015. As mentioned in Note 1, Business and Basis of Presentation, AGC sold AGLN to AGM on June 26, 2017. Both CIFGNA and Radian Asset were merged with and into AGC, with AGC as the surviving company of the merger. The impact to AGC's policyholders' surplus was a decrease of approximately $36 million from the MBIA UK acquisition, on a statutory basis, as of January 10, 2017, and an increase of $287 million from the CIFGH acquisition, on a statutory basis, as of July 1, 2016.

Schedule of Dividends Paid by Insurance Company Subsidiaries

Dividends and Return of Capital

By Insurance Company Subsidiaries

	Year Ended December 31,
	2017		2016		2015
	(in millions)
Dividends paid by AGC to AGUS	$	107	$	79	$	90
Dividends paid by AGM to AGMH	196		247		215
Dividends paid by AG Re to AGL	125		100		150
Dividends paid by MAC to MAC Holdings (1)	36		—		—
Redemption of common stock by AGM to AGMH	101		300		—
Redemption of common stock by MAC to MAC Holdings (1)	250		—		—
Repayment of surplus note by MAC to AGM	—		100		—
Repayment of surplus note by MAC to MAC Holdings (1)	—		300		—
Repayment of surplus note by AGM to AGMH	—		—		25

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(1) MAC Holdings distributed nearly the entire amounts to AGM and AGC, in proportion to their ownership percentages.