XML 73 R54.htm IDEA: XBRL DOCUMENT v2.4.0.8

Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended						3 Months Ended				9 Months Ended						3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended
	Sep. 30, 2013 Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Loans Receivable [Member] Variable Interest Entity Primary Beneficiary [Member]	Dec. 31, 2012 Loans Receivable [Member] Variable Interest Entity Primary Beneficiary [Member]	Sep. 30, 2013 Loans Receivable [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Loans Receivable [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Loans Receivable [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Loans Receivable [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Loan Repurchase Commitments [Member] Variable Interest Entity Primary Beneficiary [Member]	Dec. 31, 2012 Loan Repurchase Commitments [Member] Variable Interest Entity Primary Beneficiary [Member]	Sep. 30, 2013 Loan Repurchase Commitments [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Loan Repurchase Commitments [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Loan Repurchase Commitments [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Loan Repurchase Commitments [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 US States And Political Subdivisions [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 US States And Political Subdivisions [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 US States And Political Subdivisions [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 US States And Political Subdivisions [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Foreign Government Debt [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Foreign Government Debt [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Foreign Government Debt [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Foreign Government Debt [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Corporate Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Corporate Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Corporate Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Corporate Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Corporate Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Corporate Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Corporate Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Corporate Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Residential Mortgage Backed Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Residential Mortgage Backed Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Residential Mortgage Backed Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Residential Mortgage Backed Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Residential Mortgage Backed Non Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Residential Mortgage Backed Non Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Residential Mortgage Backed Non Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Residential Mortgage Backed Non Agency [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Residential Mortgage Backed Non Agency [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Residential Mortgage Backed Non Agency [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Residential Mortgage Backed Non Agency [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Residential Mortgage Backed Non Agency [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Commercial Mortgage Backed Securities [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Commercial Mortgage Backed Securities [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Commercial Mortgage Backed Securities [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Commercial Mortgage Backed Securities [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Commercial Mortgage Backed Securities [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Commercial Mortgage Backed Securities [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Commercial Mortgage Backed Securities [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Commercial Mortgage Backed Securities [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Collateralized Debt Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Collateralized Debt Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Collateralized Debt Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Collateralized Debt Obligations [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Collateralized Debt Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Collateralized Debt Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Collateralized Debt Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Collateralized Debt Obligations [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Other Asset Backed [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Other Asset Backed [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Other Asset Backed [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Other Asset Backed [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Other Asset Backed [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Other Asset Backed [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Other Asset Backed [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Other Asset Backed [Member] Variable Interest Entity Primary Beneficiary [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Medium Term Notes [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Medium Term Notes [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Medium Term Notes [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Medium Term Notes [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Credit Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Credit Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Credit Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Credit Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Credit Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Credit Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Credit Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Credit Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Interest Rate Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Interest Rate Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Interest Rate Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Interest Rate Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Variable Interest Entity Notes [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Variable Interest Entity Notes [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Variable Interest Entity Notes [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Variable Interest Entity Notes [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Currency Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Currency Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Currency Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Currency Derivatives [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Currency Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Currency Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Currency Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Currency Derivatives [Member] Liabilities Of Consolidated Vies [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Perpetual Debt And Equity Securities [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Perpetual Debt And Equity Securities [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Perpetual Debt And Equity Securities [Member] Fair Value Inputs Level 3 [Member]		Sep. 30, 2012 Perpetual Debt And Equity Securities [Member] Fair Value Inputs Level 3 [Member]
Accounts Notes And Loans Receivable [Line Items]
Beginning balance, fair value assets	$ 3,362		$ 3,544		$ 3,532		$ 4,188		$ 1,704	$ 1,881	$ 1,790		$ 1,903		$ 1,881		$ 2,046		$ 1,116	$ 1,086	$ 1,115		$ 1,032		$ 1,086		$ 1,077		$ 63		$ 25		$ 103		$ 28		$ 3		$ 12		$ 3		$ 11		$ 63		$ 98		$ 76		$ 207		$ 48		$ 95		$ 78		$ 69		$ 3		$ 4		$ 0		$ 8		$ 1		$ 33		$ 4		$ 17		$ 2		$ 10		$ 6		$ 21		$ 13		$ 27		$ 28		$ 24		$ 4		$ 12		$ 7		$ 22		$ 85		$ 29		$ 31		$ 60		$ 35		$ 140		$ 125		$ 203		$ 64		$ 69		$ 26		$ 317		$ 63		$ 42		$ 64		$ 67																																																										$ 10		$ 13		$ 14		$ 11
Realized gains/(losses), assets	(7)		(7)		(9)		(83)				0		0		0		0				0		0		0		0		0		0		2		0		0		0		0		0		(7)		0		(5)		(15)		0		0		(4)		0		0		0		0		0		0		(1)		0		(1)		0		0		0		0		0		0		0		0		0		0		0		0		0		(4)		(2)		(9)		0		0		0		0		0		(2)		0		(58)		0		0		0		0																																																										0		0		0		0
Unrealized gains/(losses) included in earnings, assets	(17)		70		337		29				(12)		61		208		52				1		19		140		(26)		0		0		0		0		0		0		0		0		1		4		6		9		0		(10)		(7)		(15)		0		0		0		0		0		0		0		0		0		0		6		6		0		0		0		0		(1)		1		(1)		3		0		0		0		0		1		(5)		(8)		(5)		0		0		0		0		(7)		(1)		(7)		4																																																										0		1		0		1
Unrealized gains/(losses) included in OCI, assets	9		14		31		112				0		0		0		0				0		0		0		0		0		0		(1)		0		0		0		0		0		7		(2)		11		24		0		0		6		(6)		0		0		0		1		0		2		0		(1)		0		0		0		0		0		1		4		5		0		0		0		0		7		9		11		18		0		2		5		(1)		(5)		2		(5)		71		0		0		0		0																																																										0		0		0		1
Foreign exchange recognized in OCI or earnings, assets	3		1		0		1				0		0		0		0				0		0		0		0		0		0		0		0		0		1		0		1		2		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0																																																										1		0		0		0
Purchases, assets	0		13		65		78				0		0		0		0				0		0		0		0		0		0		0		0		0		9		0		22		0		2		1		18		0		0		0		28		0		0		0		0		0		0		0		0		0		0		0		0		0		1		0		1		0		0		0		0		0		0		61		0		0		0		0		0		0		1		3		5		0		0		0		4																																																										0		0		0		0
Issuances, assets	0		0		0		0				0		0		0		0				0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0																																																										0		0		0		0
Settlements, assets	(106)		(117)		(403)		(314)				(74)		(72)		(211)		(204)				0		0		(110)		0		(1)		(2)		(4)		(5)		(3)		(10)		(11)		(19)		(14)		(13)		(14)		(29)		0		(2)		(3)		(5)		0		(1)		0		(1)		0		(5)		(3)		(11)		0		(1)		(7)		(5)		(1)		0		(2)		0		(1)		0		0		(3)		(3)		(4)		(14)		(12)		(4)		(1)		(5)		(1)		(4)		(1)		(9)		(11)		(1)		(5)		(10)		(8)																																																										0		0		0		0
Sales, assets	(6)		0		(373)		(540)				0		0		(174)		(2)				0		0		0		0		0		0		(12)		0		0		0		0		(3)		(6)		0		(29)		(140)		0		0		(25)		0		0		0		0		0		0		0		0		(3)		0		0		0		(15)		0		0		(18)		0		0		0		(24)		(8)		0		0		(5)		(10)		0		0		(84)		(74)		0		0		0		(250)		0		0		(2)		(35)																																																										0		0		0		0
Transfers into level 3, assets	41	[1]	163	[1]	195	[1]	265	[1]			0	[1]	0	[1]	0	[1]	0	[1]			0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	71	[1]	42	[1]	71	[1]	5	[1]	0	[1]	16	[1]	0	[1]	1	[1]	10	[1]	1	[1]	25	[1]	0	[1]	3	[1]	3	[1]	15	[1]	17	[1]	0	[1]	20	[1]	4	[1]	0	[1]	1	[1]	0	[1]	31	[1]	2	[1]	2	[1]	3	[1]	5	[1]	2	[1]	1	[1]	3	[1]	1	[1]	0	[1]	0	[1]	20	[1]	5	[1]	10	[1]	4	[1]	28	[1]	14	[1]	0	[1]	37	[1]	1	[1]	51	[1]	3	[1]	4	[1]	47	[1]	5	[1]	1	[1]	30	[1]	11	[1]	34	[1]																																																									0	[1]	0	[1]	0	[1]	4	[1]
Transfers out of level 3, assets	(34)	[1]	(44)	[1]	(130)	[1]	(99)	[1]			0	[1]	0	[1]	0	[1]	0	[1]			0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	(68)	[1]	0	[1]	0	[1]	0	[1]	(3)	[1]	0	[1]	0	[1]	(8)	[1]	0	[1]	(8)	[1]	0	[1]	(3)	[1]	0	[1]	(3)	[1]	(3)	[1]	(3)	[1]	(3)	[1]	(12)	[1]	(1)	[1]	(23)	[1]	(1)	[1]	(25)	[1]	0	[1]	(3)	[1]	(4)	[1]	(4)	[1]	0	[1]	0	[1]	(1)	[1]	(1)	[1]	0	[1]	0	[1]	0	[1]	(6)	[1]	(11)	[1]	(4)	[1]	(22)	[1]	(31)	[1]	(12)	[1]	0	[1]	(14)	[1]	0	[1]	(1)	[1]	0	[1]	(5)	[1]	(6)	[1]	(6)	[1]	0	[1]	(6)	[1]	0	[1]																																																									0	[1]	0	[1]	(3)	[1]	(3)	[1]
Ending balance, fair value assets	3,245		3,637		3,245		3,637		1,704	1,881	1,704		1,892		1,704		1,892		1,116	1,086	1,116		1,051		1,116		1,051		62		94		62		94		5		12		5		12		47		91		47		91		48		83		48		83		17		0		17		0		0		7		0		7		4		8		4		8		14		30		14		30		2		13		2		13		88		30		88		30		20		173		20		173		57		73		57		73		50		66		50		66																																																										11		14		11		14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets	(12)		84		347		52				(12)		61		194		52				1		19		140		(26)		0		0		0		0		0		0		0		0		1		3		6		8		0		1		0		3		0		0		0		0		0		0		0		0		0		0		0		3		0		0		0		0		0		1		1		2		0		0		1		0		(1)		(2)		2		5		0		0		0		0		(1)		1		3		5																																																										0		0		0		0
Beginning balance, fair value liabilities	2,676		5,320		5,039		7,938																																																																																																																														188		151		165		165		1,648		3,285		2,921		4,790		0		0		0		80		0		(4)		(1)		(3)		824		1,867		1,932		2,889		0		0		1		0		16		21		21		17
Realized gains/(losses), liabilities	28		(12)		1,548		420																																																																																																																														0		0		0		0		28		(12)		1,548		420		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0
Unrealized gains/(losses included in earnings, liabilities	(282)		176		(1,391)		(1,115)																																																																																																																														9		14		34		3		(285)		32		(1,562)		(1,473)		0		0		0		2		0		0		2		(1)		(6)		128		140		348		0		0		0		0		0		2		(5)		6
Unrealized gains/(losses) included in OCI, liabilities	0		0		0		0																																																																																																																														0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0
Foreign exchange recognized in OCI or earnings, liabilities	6		3		4		0																																																																																																																														7		3		5		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		(1)		0		(1)		0
Purchases, liabilities	0		0		0		0																																																																																																																														0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0
Issuances, liabilities	0		0		0		0																																																																																																																														0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0		0
Settlements, liabilities	(101)		(98)		(1,799)		(789)																																																																																																																														0		0		0		0		(28)		12		(1,548)		(420)		0		0		0		0		0		0		0		0		(73)		(110)		(251)		(369)		0		0		0		0		0		0		0		0
Sales, liabilities	0		0		(1,076)		(1,065)																																																																																																																														0		0		0		0		0		0		0		0		0		0		0		(82)		0		0		0		0		0		0		(1,076)		(983)		0		0		0		0		0		0		0		0
Transfers into Level 3, liabilities	0	[1]	5	[1]	4	[1]	5	[1]																																																																																																																													0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	4	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	4	[1]	0	[1]	4	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	1	[1]	0	[1]	1	[1]	0	[1]	0	[1]	0	[1]	0	[1]
Transfers out of Level 3, liabilities	0	[1]	0	[1]	(2)	[1]	0	[1]																																																																																																																													0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	(1)	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]	(1)	[1]	0	[1]	0	[1]	0	[1]	0	[1]	0	[1]
Ending balance, fair value liabilities	2,327		5,394		2,327		5,394																																																																																																																														204		168		204		168		1,363		3,317		1,363		3,317		0		0		0		0		0		0		0		0		745		1,885		745		1,885		0		1		0		1		15		23		15		23
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities	$ (290)		$ 182		$ 366		$ (224)																																																																																																																														$ 17		$ 14		$ 39		$ 4		$ (285)		$ 33		$ 301		$ (538)		$ 0		$ 0		$ 0		$ 0		$ (15)		$ 5		$ (21)		$ 12		$ (6)		$ 128		$ 53		$ 292		$ 0		$ 0		$ 0		$ 0		$ (1)		$ 2		$ (6)		$ 6
[1] (1) - Transferred in and out at the end of the period.

X

- Definition

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis In Foreign Exchange Recognized Other Comprehensive Income or Earnings, Assets

+ References

No definition available.

+ Details

Name:	mbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInForeignExchangeRecognizedOtherComprehensiveIncomeOrEarningsAssets
Namespace Prefix:	mbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis In Foreign Exchange Recognized Other Comprehensive Income or Earnings, Liabilities

+ References

No definition available.

+ Details

Name:	mbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInForeignExchangeRecognizedOtherComprehensiveIncomeOrEarningsLiabilities
Namespace Prefix:	mbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant