Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Net earned premiums	$ 476	$ 548	$ 690
Net investment income	378	395	417
Asset management fees	22	0	0
Net realized investment gains (losses)	22	(32)	40
Net change in fair value of credit derivatives	(6)	112	111
Fair value gains (losses) on financial guaranty variable interest entities	42	14	30
Foreign exchange gains (losses) on remeasurement	24	(37)	60
Bargain purchase gain and settlement of pre-existing relationships	0	0	58
Commutation gains (losses)	1	(16)	328
Other income (loss)	4	17	5
Total revenues	963	1,001	1,739
Expenses
Loss and loss adjustment expenses	93	64	388
Interest expense	89	94	97
Amortization of deferred acquisition costs	18	16	19
Employee compensation and benefit expenses	178	152	143
Other operating expenses	125	96	101
Total expenses	503	422	748
Income (loss) before income taxes and equity in net earnings of investees	460	579	991
Equity in net earnings of investees	4	1	0
Income (loss) before income taxes	464	580	991
Provision (benefit) for income taxes
Current	(2)	(15)	11
Deferred	65	74	250
Total provision (benefit) for income taxes	63	59	261
Net income (loss)	401	521	730
Less: Redeemable noncontrolling interests	(1)	0	0
Net income (loss) attributable to Assured Guaranty Ltd.	$ 402	$ 521	$ 730
Earnings per share:
Basic (in dollars per share)	$ 4.04	$ 4.73	$ 6.05
Diluted (in dollars per share)	$ 4.00	$ 4.68	$ 5.96