Fair Value FV Measurement 2 - Level 3 Reconciliation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	$ (266)		$ (141)		$ (549)		$ 25
Net unrealized gains (losses) included in net income (loss) related to assets still held	(97)		(99)		(331)		(94)
Interest Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	(62)		(60)		(187)		(205)
Net unrealized gains (losses) included in net income (loss) related to assets still held	0		0		0		0
Fair Value Gains (Losses), Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	(181)		(117)		(342)		(237)
Net unrealized gains (losses) included in net income (loss) related to assets still held	(97)		(99)		(331)		(94)
Net Other-than-Temporary Impairments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	11		37		20		476
Net unrealized gains (losses) included in net income (loss) related to assets still held	0		0		0		0
Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	(34)		(1)		(40)		(9)
Net unrealized gains (losses) included in net income (loss) related to assets still held	0		0		0		0
Trading securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,959		2,305		2,286		4,238
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	97		85		384		130
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	(50)	[2]	0	[2]	(50)	[2]	(33)	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(92)	[3]	(67)	[3]	(235)	[3]	(330)	[3]
Transfers out of Level 3	(231)	[4]	(54)	[4]	(437)	[4]	(2,060)	[4]
Transfers Into Level 3	2	[4]	304	[4]	737	[4]	628	[4]
Ending Balance	2,685		2,573		2,685		2,573
Net unrealized gains (losses) included in net income (loss) related to assets still held	69	[5]	80	[5]	346	[5]	63	[5]
Trading securities [Member] | Fannie Mae [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	52		82		68		1,737
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	(2)		(1)		(8)		1
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	(33)	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(4)	[3]	(5)	[3]	(14)	[3]	(113)	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	(1,581)	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	65	[4]
Ending Balance	46		76		46		76
Net unrealized gains (losses) included in net income (loss) related to assets still held	(2)	[5]	(1)	[5]	(8)	[5]	(3)	[5]
Trading securities [Member] | Freddie Mac [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2		2		2		0
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	0		0		0		0
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(1)	[3]	0	[3]	(1)	[3]	0	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	2	[4]
Ending Balance	1		2		1		2
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Trading securities [Member] | Ginnie Mae [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2		0		1		9
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	0		0		0		0
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	0	[3]	0	[3]	(1)	[3]	0	[3]
Transfers out of Level 3	(2)	[4]	0	[4]	(2)	[4]	(9)	[4]
Transfers Into Level 3	2	[4]	1	[4]	4	[4]	1	[4]
Ending Balance	2		1		2		1
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Trading securities [Member] | Alt-A private-label securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	703		188		104		345
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	88		12		215		81
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(42)	[3]	(19)	[3]	(97)	[3]	(86)	[3]
Transfers out of Level 3	(229)	[4]	(54)	[4]	(435)	[4]	(470)	[4]
Transfers Into Level 3	0	[4]	303	[4]	733	[4]	560	[4]
Ending Balance	520		430		520		430
Net unrealized gains (losses) included in net income (loss) related to assets still held	63	[5]	7	[5]	183	[5]	19	[5]
Trading securities [Member] | Subprime private-label securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,488		1,226		1,319		1,280
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	12		78		251		100
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	(50)	[2]	0	[2]	(50)	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(39)	[3]	(39)	[3]	(109)	[3]	(115)	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Ending Balance	1,411		1,265		1,411		1,265
Net unrealized gains (losses) included in net income (loss) related to assets still held	10	[5]	78	[5]	245	[5]	99	[5]
Trading securities [Member] | Mortgage revenue bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	603		689		675		724
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	(3)		(5)		(72)		(31)
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(5)	[3]	(3)	[3]	(8)	[3]	(12)	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Ending Balance	595		681		595		681
Net unrealized gains (losses) included in net income (loss) related to assets still held	(4)	[5]	(5)	[5]	(72)	[5]	(31)	[5]
Trading securities [Member] | Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	109		118		117		143
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	2		1		(2)		(21)
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(1)	[3]	(1)	[3]	(5)	[3]	(4)	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Ending Balance	110		118		110		118
Net unrealized gains (losses) included in net income (loss) related to assets still held	2	[5]	1	[5]	(2)	[5]	(21)	[5]
Available-for-sale securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	24,340		26,328		25,034		29,492
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	88		27		213		(253)
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	184	[1]	670	[1]	1,377	[1]	1,403	[1]
Purchases	312	[2]	64	[2]	312	[2]	70	[2]
Sales	(3,932)	[2]	(64)	[2]	(3,951)	[2]	(112)	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(1,106)	[3]	(1,370)	[3]	(3,712)	[3]	(3,606)	[3]
Transfers out of Level 3	(1,151)	[4]	(769)	[4]	(3,130)	[4]	(3,571)	[4]
Transfers Into Level 3	244	[4]	954	[4]	2,836	[4]	2,417	[4]
Ending Balance	18,979		25,840		18,979		25,840
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-sale securities [Member] | Fannie Mae [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	10		34		29		946
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	0		0		0		0
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	(1)	[1]	(8)	[1]
Purchases	0	[2]	35	[2]	0	[2]	41	[2]
Sales	0	[2]	(35)	[2]	0	[2]	(41)	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(2)	[3]	(2)	[3]	(6)	[3]	(21)	[3]
Transfers out of Level 3	0	[4]	0	[4]	(14)	[4]	(895)	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	10	[4]
Ending Balance	8		32		8		32
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-sale securities [Member] | Freddie Mac [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	9		11		10		12
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	0		0		0		0
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	(1)	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	0	[3]	(1)	[3]	(1)	[3]	(2)	[3]
Transfers out of Level 3	(1)	[4]	0	[4]	(1)	[4]	0	[4]
Transfers Into Level 3	1	[4]	0	[4]	2	[4]	0	[4]
Ending Balance	9		10		9		10
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-sale securities [Member] | Ginnie Mae [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	0				0
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	0				0
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]			0	[1]
Purchases	0	[2]			0	[2]
Sales	0	[2]			0	[2]
Issues	0	[3]			0	[3]
Settlements	0	[3]			0	[3]
Transfers out of Level 3	0	[4]			0	[4]
Transfers Into Level 3	1	[4]			1	[4]
Ending Balance	1				1
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]			0	[5]
Available-for-sale securities [Member] | Alt-A private-label securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	7,008		6,456		6,564		7,256
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	120		5		140		(97)
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	(55)	[1]	179	[1]	412	[1]	472	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	(2,663)	[2]	0	[2]	(2,663)	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(263)	[3]	(263)	[3]	(932)	[3]	(800)	[3]
Transfers out of Level 3	(1,150)	[4]	(769)	[4]	(3,115)	[4]	(2,676)	[4]
Transfers Into Level 3	242	[4]	954	[4]	2,833	[4]	2,407	[4]
Ending Balance	3,239		6,562		3,239		6,562
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-sale securities [Member] | Subprime private-label securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	7,862		7,230		7,447		7,586
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	(25)		27		65		(168)
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	327	[1]	434	[1]	1,238	[1]	940	[1]
Purchases	312	[2]	0	[2]	312	[2]	0	[2]
Sales	(1,269)	[2]	0	[2]	(1,269)	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(242)	[3]	(319)	[3]	(828)	[3]	(986)	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Ending Balance	6,965		7,372		6,965		7,372
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-sale securities [Member] | Mortgage revenue bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	6,400		9,353		7,837		10,247
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	(10)		2		0		5
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	(83)	[1]	7	[1]	(365)	[1]	(13)	[1]
Purchases	0	[2]	29	[2]	0	[2]	29	[2]
Sales	0	[2]	(29)	[2]	(19)	[2]	(71)	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(508)	[3]	(693)	[3]	(1,654)	[3]	(1,528)	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Ending Balance	5,799		8,669		5,799		8,669
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Available-for-sale securities [Member] | Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,051		3,244		3,147		3,445
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	3		(7)		8		7
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	(5)	[1]	50	[1]	94	[1]	12	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(91)	[3]	(92)	[3]	(291)	[3]	(269)	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Ending Balance	2,958		3,195		2,958		3,195
Net unrealized gains (losses) included in net income (loss) related to assets still held	0	[5]	0	[5]	0	[5]	0	[5]
Mortgage Loans [Member] | Consolidated Trusts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,961		2,331		2,634		2,319
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	187		96		244		216
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	52	[2]	146	[2]	295	[2]	533	[2]
Sales	(393)	[2]	0	[2]	(393)	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	(114)	[3]	(123)	[3]	(348)	[3]	(292)	[3]
Transfers out of Level 3	(192)	[4]	(60)	[4]	(281)	[4]	(404)	[4]
Transfers Into Level 3	135	[4]	26	[4]	485	[4]	44	[4]
Ending Balance	2,636		2,416		2,636		2,416
Net unrealized gains (losses) included in net income (loss) related to assets still held	19	[5]	87	[5]	18	[5]	143	[5]
Net derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(49)		74		14		65
Total Gains or (Losses) (Realized/Unrealized) Included in Net Income (Loss)	2		(1)		(127)		14
Total Gains or (Losses) (Realized/Unrealized) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	(2)	[3]	0	[3]	(8)	[3]
Settlements	21	[3]	(41)	[3]	75	[3]	(41)	[3]
Transfers out of Level 3	0	[4]	0	[4]	16	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	(4)	[4]	0	[4]
Ending Balance	(26)		30		(26)		30
Net unrealized gains (losses) included in net income (loss) related to assets still held	(7)	[5]	(9)	[5]	(38)	[5]	8	[5]
Long-term debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(1,414)		(1,731)		(1,528)		(1,171)
Total Gains (Losses) (Realized/Unrealized) Included in Net Loss	(108)		(66)		(165)		(132)
Total Gains or (Losses) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	(38)	[3]	(20)	[3]	(523)	[3]
Settlements	405	[3]	69	[3]	510	[3]	147	[3]
Transfers out of Level 3	234	[4]	62	[4]	404	[4]	172	[4]
Transfers Into Level 3	(6)	[4]	(152)	[4]	(90)	[4]	(349)	[4]
Ending Balance	(889)		(1,856)		(889)		(1,856)
Net Unrealized Gain (Loss) Included in Net Loss Related to Liabilities Still Held	16	[5]	(59)	[5]	5	[5]	(120)	[5]
Long-term debt [Member] | Consolidated Trusts [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(1,077)		(1,319)		(1,128)		(765)
Total Gains (Losses) (Realized/Unrealized) Included in Net Loss	(121)		(47)		(241)		(107)
Total Gains or (Losses) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	(38)	[3]	(20)	[3]	(523)	[3]
Settlements	405	[3]	69	[3]	510	[3]	147	[3]
Transfers out of Level 3	234	[4]	62	[4]	404	[4]	172	[4]
Transfers Into Level 3	(6)	[4]	(152)	[4]	(90)	[4]	(349)	[4]
Ending Balance	(565)		(1,425)		(565)		(1,425)
Net Unrealized Gain (Loss) Included in Net Loss Related to Liabilities Still Held	3	[5]	(40)	[5]	(71)	[5]	(95)	[5]
Long-term debt [Member] | Senior Floating [Member] | Fannie Mae [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(337)		(412)		(400)		(406)
Total Gains (Losses) (Realized/Unrealized) Included in Net Loss	13		(19)		76		(25)
Total Gains or (Losses) Included in Other Comprehensive Income (Loss)	0	[1]	0	[1]	0	[1]	0	[1]
Purchases	0	[2]	0	[2]	0	[2]	0	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Issues	0	[3]	0	[3]	0	[3]	0	[3]
Settlements	0	[3]	0	[3]	0	[3]	0	[3]
Transfers out of Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Transfers Into Level 3	0	[4]	0	[4]	0	[4]	0	[4]
Ending Balance	(324)		(431)		(324)		(431)
Net Unrealized Gain (Loss) Included in Net Loss Related to Liabilities Still Held	$ 13	[5]	$ (19)	[5]	$ 76	[5]	$ (25)	[5]

[1] (Losses) gains included in other comprehensive income are included in “Changes in unrealized gains on available-for-sale securities, net of reclassification adjustments and taxes” in the condensed consolidated statements of operations and comprehensive income.

[2] Purchases and sales include activity related to the consolidation and deconsolidation of assets of securitization trusts.

[3] Issues and settlements include activity related to the consolidation and deconsolidation of liabilities of securitization trusts.

[4] Transfers out of Level 3 consisted primarily of Fannie Mae MBS and private-label mortgage-related securities backed by Alt-A loans. Prices for these securities were obtained from multiple third-party vendors supported by market observable inputs. Transfers into Level 3 consisted primarily of private-label mortgage-related securities backed by Alt-A loans. Prices for these securities are based on inputs from a single source or inputs that were not readily observable.

[5] Amount represents temporary changes in fair value. Amortization, accretion and other-than-temporary impairments are not considered unrealized and are not included in this amount.