Subsidiary Information - Condensed Consolidating Statement of Cash Flows (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	$ 23,000,000	$ 101,000,000
Fixed-maturity securities:
Purchases	(448,000,000)	(517,000,000)
Sales	841,000,000	155,000,000
Maturities	155,000,000	148,000,000
Net sales (purchases) of short-term investments	420,000,000	184,000,000
Net proceeds from financial guaranty variable entities’ assets	30,000,000	286,000,000
Intercompany debt	0ago_InvestingActivitiesIntercompanyDebt	0ago_InvestingActivitiesIntercompanyDebt
Investment in subsidiary	0	0
Other	3,000,000	19,000,000
Net cash flows provided by (used in) investing activities	1,001,000,000	275,000,000
Cash flows from financing activities
Return of capital	0	0
Dividends paid	(19,000,000)us-gaap_PaymentsOfDividendsCommonStock	(20,000,000)us-gaap_PaymentsOfDividendsCommonStock
Repurchases of common stock	(152,000,000)	(35,000,000)
Share activity under option and incentive plans	(5,000,000)	0
Net paydowns of financial guaranty variable interest entities’ liabilities	(39,000,000)	(281,000,000)
Payment of long-term debt	(1,000,000)us-gaap_RepaymentsOfLongTermDebt	(6,000,000)us-gaap_RepaymentsOfLongTermDebt
Intercompany debt	0ago_FinancingActivitiesIntercompanyDebt	0ago_FinancingActivitiesIntercompanyDebt
Other	4,000,000	0
Net cash flows provided by (used in) financing activities	(212,000,000)	(342,000,000)
Effect of foreign exchange rate changes	(2,000,000)	1,000,000
Increase (decrease) in cash	810,000,000	35,000,000
Cash at beginning of period	75,000,000us-gaap_Cash	184,000,000us-gaap_Cash
Cash at end of period	885,000,000us-gaap_Cash	219,000,000us-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	97,000,000	58,000,000
Fixed-maturity securities:
Purchases	0	0
Sales	0	0
Maturities	0	0
Net sales (purchases) of short-term investments	79,000,000	(3,000,000)
Net proceeds from financial guaranty variable entities’ assets	0	0
Intercompany debt	0	0
Investment in subsidiary	0	0
Other	0	0
Net cash flows provided by (used in) investing activities	79,000,000	(3,000,000)
Cash flows from financing activities
Return of capital	0	0
Dividends paid	(19,000,000)	(20,000,000)
Repurchases of common stock	(152,000,000)	(35,000,000)
Share activity under option and incentive plans	(5,000,000)	0
Net paydowns of financial guaranty variable interest entities’ liabilities	0	0
Payment of long-term debt	0	0
Intercompany debt	0	0
Other	0
Net cash flows provided by (used in) financing activities	(176,000,000)	(55,000,000)
Effect of foreign exchange rate changes	0	0
Increase (decrease) in cash	0	0
Cash at beginning of period	0	0
Cash at end of period	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	127,000,000	0
Fixed-maturity securities:
Purchases	(46,000,000)	(1,000,000)
Sales	122,000,000	0
Maturities	4,000,000	0
Net sales (purchases) of short-term investments	43,000,000	0
Net proceeds from financial guaranty variable entities’ assets	0	0
Intercompany debt	(200,000,000)	0
Investment in subsidiary	0	0
Other	0	0
Net cash flows provided by (used in) investing activities	(77,000,000)	(1,000,000)
Cash flows from financing activities
Return of capital	0	0
Dividends paid	(50,000,000)	0
Repurchases of common stock	0	0
Share activity under option and incentive plans	0	0
Net paydowns of financial guaranty variable interest entities’ liabilities	0	0
Payment of long-term debt	0	0
Intercompany debt	0	0
Other	0
Net cash flows provided by (used in) financing activities	(50,000,000)	0
Effect of foreign exchange rate changes	0	0
Increase (decrease) in cash	0	(1,000,000)
Cash at beginning of period	0	67,000,000
Cash at end of period	0	66,000,000
Reportable Legal Entities [Member] \| AGMH (Issuer) [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	59,000,000	(6,000,000)
Fixed-maturity securities:
Purchases	(6,000,000)	(3,000,000)
Sales	11,000,000	0
Maturities	0	0
Net sales (purchases) of short-term investments	19,000,000	(16,000,000)
Net proceeds from financial guaranty variable entities’ assets	0	0
Intercompany debt	0	0
Investment in subsidiary	25,000,000	25,000,000
Other	0	0
Net cash flows provided by (used in) investing activities	49,000,000	6,000,000
Cash flows from financing activities
Return of capital	0	0
Dividends paid	(108,000,000)	0
Repurchases of common stock	0	0
Share activity under option and incentive plans	0	0
Net paydowns of financial guaranty variable interest entities’ liabilities	0	0
Payment of long-term debt	0	0
Intercompany debt	0	0
Other	0
Net cash flows provided by (used in) financing activities	(108,000,000)	0
Effect of foreign exchange rate changes	0	0
Increase (decrease) in cash	0	0
Cash at beginning of period	4,000,000	0
Cash at end of period	4,000,000	0
Reportable Legal Entities [Member] \| Other Entities [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	34,000,000	111,000,000
Fixed-maturity securities:
Purchases	(396,000,000)	(513,000,000)
Sales	708,000,000	155,000,000
Maturities	151,000,000	148,000,000
Net sales (purchases) of short-term investments	279,000,000	203,000,000
Net proceeds from financial guaranty variable entities’ assets	30,000,000	286,000,000
Intercompany debt	0	0
Investment in subsidiary	0	0
Other	3,000,000	19,000,000
Net cash flows provided by (used in) investing activities	775,000,000	298,000,000
Cash flows from financing activities
Return of capital	(25,000,000)	(25,000,000)
Dividends paid	(136,000,000)	(62,000,000)
Repurchases of common stock	0	0
Share activity under option and incentive plans	0	0
Net paydowns of financial guaranty variable interest entities’ liabilities	(39,000,000)	(281,000,000)
Payment of long-term debt	(1,000,000)	(6,000,000)
Intercompany debt	200,000,000	0
Other	4,000,000
Net cash flows provided by (used in) financing activities	3,000,000	(374,000,000)
Effect of foreign exchange rate changes	(2,000,000)	1,000,000
Increase (decrease) in cash	810,000,000	36,000,000
Cash at beginning of period	71,000,000	117,000,000
Cash at end of period	881,000,000	153,000,000
Consolidating Adjustments [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash flows provided by (used in) operating activities	(294,000,000)	(62,000,000)
Fixed-maturity securities:
Purchases	0	0
Sales	0	0
Maturities	0	0
Net sales (purchases) of short-term investments	0	0
Net proceeds from financial guaranty variable entities’ assets	0	0
Intercompany debt	200,000,000	0
Investment in subsidiary	(25,000,000)	(25,000,000)
Other	0	0
Net cash flows provided by (used in) investing activities	175,000,000	(25,000,000)
Cash flows from financing activities
Return of capital	25,000,000	25,000,000
Dividends paid	294,000,000	62,000,000
Repurchases of common stock	0	0
Share activity under option and incentive plans	0	0
Net paydowns of financial guaranty variable interest entities’ liabilities	0	0
Payment of long-term debt	0	0
Intercompany debt	(200,000,000)	0
Other	0
Net cash flows provided by (used in) financing activities	119,000,000	87,000,000
Effect of foreign exchange rate changes	0	0
Increase (decrease) in cash	0	0
Cash at beginning of period	0	0
Cash at end of period	$ 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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No definition available.

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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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No definition available.

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

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

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

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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