Subsidiary Information - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	$ 577	$ 244	$ (165)
Fixed-maturity securities:
Purchases	(2,801)	(1,886)	(1,649)
Sales	1,251	1,029	912
Maturities	877	883	1,105
Sales (purchases) of short-term investments, net	158	(87)	29
Net proceeds from financial guaranty variable entities’ assets	408	663	545
Acquisition of MAC	0	0	(91)
Intercompany debt	0ago_InvestingActivitiesIntercompanyDebt	0ago_InvestingActivitiesIntercompanyDebt	0ago_InvestingActivitiesIntercompanyDebt
Investment in subsidiary	0	0	0
Other	11	79	92
Net cash flows provided by (used in) investing activities	(96)	681	943
Cash flows from financing activities
Issuance of common stock	0	0	173
Return of capital	0	0	0
Capital contribution from parent	0	0	0
Dividends paid	(76)us-gaap_PaymentsOfDividendsCommonStock	(75)us-gaap_PaymentsOfDividendsCommonStock	(69)us-gaap_PaymentsOfDividendsCommonStock
Repurchases of common stock	(590.0)	(264.0)	(24.0)
Share activity under option and incentive plans	1	(1)	(3)
Net paydowns of financial guaranty variable entities’ liabilities	(396)	(511)	(724)
Net proceeds from issuance of long-term debt	495	0	0
Payment of long-term debt	(19)us-gaap_RepaymentsOfLongTermDebt	(27)us-gaap_RepaymentsOfLongTermDebt	(209)us-gaap_RepaymentsOfLongTermDebt
Intercompany debt	0ago_FinancingActivitiesIntercompanyDebt	0ago_FinancingActivitiesIntercompanyDebt	0ago_FinancingActivitiesIntercompanyDebt
Net cash flows provided by (used in) financing activities	(585)	(878)	(856)
Effect of foreign exchange rate changes	(5)	(1)	1
Increase (decrease) in cash	(109)	46	(77)
Cash at beginning of period	184us-gaap_Cash	138us-gaap_Cash	215us-gaap_Cash
Cash at end of period	75us-gaap_Cash	184us-gaap_Cash	138us-gaap_Cash
Reportable Legal Entities [Member] \| Assured Guaranty Ltd. (Parent) [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	758	128	138
Fixed-maturity securities:
Purchases	0	0	(211)
Sales	0	176	0
Maturities	0	29	3
Sales (purchases) of short-term investments, net	(93)	7	(7)
Net proceeds from financial guaranty variable entities’ assets		0	0
Acquisition of MAC			0
Intercompany debt	0	0	0
Investment in subsidiary	0	0	0
Other	0	0	0
Net cash flows provided by (used in) investing activities	(93)	212	(215)
Cash flows from financing activities
Issuance of common stock			173
Return of capital	0	0	0
Capital contribution from parent	0	0	0
Dividends paid	(76)	(75)	(69)
Repurchases of common stock	(590.0)	(264.0)	(24.0)
Share activity under option and incentive plans	1	(1)	(3)
Net paydowns of financial guaranty variable entities’ liabilities	0	0	0
Net proceeds from issuance of long-term debt	0
Payment of long-term debt	0	0	0
Intercompany debt	0	0	0
Net cash flows provided by (used in) financing activities	(665)	(340)	77
Effect of foreign exchange rate changes	0	0	0
Increase (decrease) in cash	0	0	0
Cash at beginning of period	0	0	0
Cash at end of period	0	0	0
Reportable Legal Entities [Member] \| AGUS (Issuer) [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	223	178	6
Fixed-maturity securities:
Purchases	(540)	(93)	(1)
Sales	464	1	0
Maturities	6	3	0
Sales (purchases) of short-term investments, net	(15)	(28)	27
Net proceeds from financial guaranty variable entities’ assets		0	0
Acquisition of MAC			(91)
Intercompany debt	0	0	0
Investment in subsidiary	0	0	0
Other	0	0	0
Net cash flows provided by (used in) investing activities	(85)	(117)	(65)
Cash flows from financing activities
Issuance of common stock			0
Return of capital	0	0	0
Capital contribution from parent	0	0	0
Dividends paid	(700)	0	0
Repurchases of common stock	0	0	0
Share activity under option and incentive plans	0	0	0
Net paydowns of financial guaranty variable entities’ liabilities	0	0	0
Net proceeds from issuance of long-term debt	495
Payment of long-term debt	0	0	(173)
Intercompany debt	0	(7)	173
Net cash flows provided by (used in) financing activities	(205)	(7)	0
Effect of foreign exchange rate changes	0	0	0
Increase (decrease) in cash	(67)	54	(59)
Cash at beginning of period	67	13	72
Cash at end of period	0	67	13
Reportable Legal Entities [Member] \| AGMH (Issuer) [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	144	133	20
Fixed-maturity securities:
Purchases	(8)	(26)	(13)
Sales	10	25	13
Maturities	1	2	6
Sales (purchases) of short-term investments, net	(3)	(15)	26
Net proceeds from financial guaranty variable entities’ assets		0	0
Acquisition of MAC			0
Intercompany debt	0	0	0
Investment in subsidiary	50	49	46
Other	0	0	0
Net cash flows provided by (used in) investing activities	50	35	78
Cash flows from financing activities
Issuance of common stock			0
Return of capital	0	0	0
Capital contribution from parent	0	0	0
Dividends paid	(190)	(168)	(98)
Repurchases of common stock	0	0	0
Share activity under option and incentive plans	0	0	0
Net paydowns of financial guaranty variable entities’ liabilities	0	0	0
Net proceeds from issuance of long-term debt	0
Payment of long-term debt	0	0	0
Intercompany debt	0	0	0
Net cash flows provided by (used in) financing activities	(190)	(168)	(98)
Effect of foreign exchange rate changes	0	0	0
Increase (decrease) in cash	4	0	0
Cash at beginning of period	0	0	0
Cash at end of period	4	0	0
Reportable Legal Entities [Member] \| Other Entities [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	663	347	5
Fixed-maturity securities:
Purchases	(2,253)	(1,832)	(1,424)
Sales	777	892	899
Maturities	870	849	1,096
Sales (purchases) of short-term investments, net	269	(51)	(17)
Net proceeds from financial guaranty variable entities’ assets	408	663	545
Acquisition of MAC			0
Intercompany debt	0	7	(173)
Investment in subsidiary	0	0	0
Other	11	79	92
Net cash flows provided by (used in) investing activities	82	607	1,018
Cash flows from financing activities
Issuance of common stock			0
Return of capital	(50)	(50)	(50)
Capital contribution from parent	0	1	4
Dividends paid	(321)	(374)	(236)
Repurchases of common stock	0	0	0
Share activity under option and incentive plans	0	0	0
Net paydowns of financial guaranty variable entities’ liabilities	(396)	(511)	(724)
Net proceeds from issuance of long-term debt	0
Payment of long-term debt	(19)	(27)	(36)
Intercompany debt	0	0	0
Net cash flows provided by (used in) financing activities	(786)	(961)	(1,042)
Effect of foreign exchange rate changes	(5)	(1)	1
Increase (decrease) in cash	(46)	(8)	(18)
Cash at beginning of period	117	125	143
Cash at end of period	71	117	125
Consolidating Adjustments [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	(1,211)	(542)	(334)
Fixed-maturity securities:
Purchases	0	65	0
Sales	0	(65)	0
Maturities	0	0	0
Sales (purchases) of short-term investments, net	0	0	0
Net proceeds from financial guaranty variable entities’ assets	0	0	0
Acquisition of MAC			0
Intercompany debt	0	(7)	173
Investment in subsidiary	(50)	(49)	(46)
Other	0	0	0
Net cash flows provided by (used in) investing activities	(50)	(56)	127
Cash flows from financing activities
Issuance of common stock			0
Return of capital	50	50	50
Capital contribution from parent	0	(1)	(4)
Dividends paid	1,211	542	334
Repurchases of common stock	0	0	0
Share activity under option and incentive plans	0	0	0
Net paydowns of financial guaranty variable entities’ liabilities	0	0	0
Net proceeds from issuance of long-term debt	0
Payment of long-term debt	0	0	0
Intercompany debt	0	7	(173)
Net cash flows provided by (used in) financing activities	1,261	598	207
Effect of foreign exchange rate changes	0	0	0
Increase (decrease) in cash	0	0	0
Cash at beginning of period	0	0	0
Cash at end of period	$ 0	$ 0	$ 0

Financing Activities, Intercompany Debt

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Investing Activities, Intercompany Debt

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Payments to reduce the outstanding balance of consolidated variable interest entities recourse and non-recourse liabilities. The Company consolidated these variable interest entities as the result of its control rights obtained under financial guaranty insurance contracts.

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Proceeds received on consolidated variable interest entities assets. The Company consolidates these variable interest entities as the result of its control rights obtained under financial guaranty insurance contracts.

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This element represents cash inflow (outflow) in satisfaction of withholding tax requirements in enterprise's financing activities, option exercises and other share activity under incentive plans.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

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The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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