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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Beginning balance	$ (128)		$ (61)	$ 21
Other comprehensive income (loss) before reclassification	101	[1]	(68)	(81)
Amounts reclassified from AOCI	8		1	(1)
Total other comprehensive income (loss)	109		(67)	(82)
Ending balance	(19)		(128)	(61)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	6		(22)	34
Other comprehensive income (loss) before reclassification	(24)		27	(55)
Amounts reclassified from AOCI	8		1	(1)
Total other comprehensive income (loss)	(16)		28	(56)
Ending balance	(10)		6	(22)
Foreign currency translation, net [Member]
Beginning balance	(134)		(39)	(13)
Other comprehensive income (loss) before reclassification	125		(95)	(26)
Amounts reclassified from AOCI	0		0	0
Total other comprehensive income (loss)	125		(95)	(26)
Ending balance	$ (9)		$ (134)	$ (39)
[1] Includes items included in the Company's loss calculation to adjust the carrying value of MBIA UK to its fair value less costs to sell for the year ended December 31, 2016. The sale was completed in January of 2017 and as such, these amounts included in AOCI were reversed and included in the Sale Transaction.

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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-Name Accounting Standards Codification
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-SubTopic 10
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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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