Fair Value Recurring Changes in Fair Value (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Trading securities	$ 17,950
Available-for-sale securities	0
Mortgage loans held for investment	0
Other assets [Abstract]
Derivatives	0
Total assets at fair value	93,736
Other liabilities [Abstract]
Derivatives	0
Total liabilities at fair value	0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Trading securities	20,459
Available-for-sale securities	38,147
Mortgage loans held for investment	2,567,022
Other assets [Abstract]
Derivatives	16,051
Total assets at fair value	2,694,632
Other liabilities [Abstract]
Derivatives	22,590
Total liabilities at fair value	3,347,367
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Trading securities	2,286
Available-for-sale securities	25,034
Mortgage loans held for investment	466,594
Other assets [Abstract]
Derivatives	175
Total assets at fair value	495,561
Other liabilities [Abstract]
Derivatives	161
Total liabilities at fair value	23,984
Netting Adjustment [Member]
Assets [Abstract]
Trading securities	0
Available-for-sale securities	0
Mortgage loans held for investment	0
Other assets [Abstract]
Derivatives	(15,791)
Total assets at fair value	(15,791)
Other liabilities [Abstract]
Derivatives	(22,046)
Total liabilities at fair value	(22,046)
Estimated Fair Value [Member]
Assets [Abstract]
Trading securities	40,695		74,198
Available-for-sale securities	63,181		77,582
Mortgage loans held for investment	3,033,616		2,947,021
Other assets [Abstract]
Derivatives	435		561
Total assets at fair value	3,268,138		3,220,344
Other liabilities [Abstract]
Derivatives	705		916
Total liabilities at fair value	3,349,305		3,367,255
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash equivalents	1,150	[1]	600	[1]
Trading securities	17,950		47,737
Available-for-sale securities	0		0
Other assets [Abstract]
Derivatives	0		0
Total assets at fair value	19,100		48,337
Liabilities [Abstract]
Long-term debt	0		0
Other liabilities [Abstract]
Derivatives	0		0
Total liabilities at fair value	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Swap [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Swaption [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Netting adjustment [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Commitment Derivatives [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fannie Mae [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Freddie Mac [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Ginnie Mae [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alt-A private-label securities [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Subprime private-label securities [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | CMBS [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage revenue bonds [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Securities [Member]
Assets [Abstract]
Trading securities	17,950		47,737
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Asset-Backed Securities [Member]
Assets [Abstract]
Trading securities			0
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash equivalents	0	[1]	0	[1]
Trading securities	20,459		22,223
Available-for-sale securities	38,147		48,090
Other assets [Abstract]
Derivatives	16,051		16,152
Total assets at fair value	82,823		87,757
Liabilities [Abstract]
Long-term debt	10,912		3,606
Other liabilities [Abstract]
Derivatives	22,590		22,641
Total liabilities at fair value	33,502		26,247
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Swap [Member]
Other assets [Abstract]
Derivatives	12,224		9,247
Other liabilities [Abstract]
Derivatives	19,836		18,661
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Swaption [Member]
Other assets [Abstract]
Derivatives	3,674		6,536
Other liabilities [Abstract]
Derivatives	2,463		3,432
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [Member]
Other assets [Abstract]
Derivatives	0		1
Other liabilities [Abstract]
Derivatives	1
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Netting adjustment [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage Commitment Derivatives [Member]
Other assets [Abstract]
Derivatives	153		368
Other liabilities [Abstract]
Derivatives	290		548
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fannie Mae [Member]
Assets [Abstract]
Trading securities	6,180		5,687
Available-for-sale securities	10,406		15,904
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Freddie Mac [Member]
Assets [Abstract]
Trading securities	2,791		2,732
Available-for-sale securities	9,370		12,811
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Ginnie Mae [Member]
Assets [Abstract]
Trading securities	436		278
Available-for-sale securities	751		902
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alt-A private-label securities [Member]
Assets [Abstract]
Trading securities	1,226		1,004
Available-for-sale securities	4,511		4,427
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Subprime private-label securities [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | CMBS [Member]
Assets [Abstract]
Trading securities	9,826		10,411
Available-for-sale securities	13,097		14,026
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage revenue bonds [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	5		7
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	7		13
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities [Member]
Assets [Abstract]
Trading securities	0		0
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member]
Assets [Abstract]
Trading securities			2,111
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash equivalents	0	[1]	0	[1]
Trading securities	2,286		4,238
Available-for-sale securities	25,034		29,492
Other assets [Abstract]
Derivatives	175		238
Total assets at fair value	30,129		36,287
Liabilities [Abstract]
Long-term debt	1,528		1,171
Other liabilities [Abstract]
Derivatives	161		173
Total liabilities at fair value	1,689		1,344
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Swap [Member]
Other assets [Abstract]
Derivatives	146		170
Other liabilities [Abstract]
Derivatives	154		167
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Swaption [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other [Member]
Other assets [Abstract]
Derivatives	26		51
Other liabilities [Abstract]
Derivatives	0
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Netting adjustment [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Commitment Derivatives [Member]
Other assets [Abstract]
Derivatives	3		17
Other liabilities [Abstract]
Derivatives	7		6
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]
Assets [Abstract]
Trading securities	68		1,737
Available-for-sale securities	29		946
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Freddie Mac [Member]
Assets [Abstract]
Trading securities	2		0
Available-for-sale securities	10		12
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Ginnie Mae [Member]
Assets [Abstract]
Trading securities	1		9
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alt-A private-label securities [Member]
Assets [Abstract]
Trading securities	104		345
Available-for-sale securities	6,564		7,256
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Subprime private-label securities [Member]
Assets [Abstract]
Trading securities	1,319		1,280
Available-for-sale securities	7,447		7,586
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | CMBS [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage revenue bonds [Member]
Assets [Abstract]
Trading securities	675		724
Available-for-sale securities	7,837		10,247
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other [Member]
Assets [Abstract]
Trading securities	117		143
Available-for-sale securities	3,147		3,445
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities [Member]
Assets [Abstract]
Trading securities	0		0
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Asset-Backed Securities [Member]
Assets [Abstract]
Trading securities			0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member]
Assets [Abstract]
Cash equivalents	0	[1]	0	[1]
Trading securities	0		0
Available-for-sale securities	0		0
Other assets [Abstract]
Derivatives	(15,791)	[2]	(15,829)	[2]
Total assets at fair value	(15,791)	[2]	(15,829)	[2]
Liabilities [Abstract]
Long-term debt	0		0
Other liabilities [Abstract]
Derivatives	(22,046)	[2]	(21,898)	[2]
Total liabilities at fair value	(22,046)	[2]	(21,898)	[2]
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Swap [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Swaption [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Other [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Netting adjustment [Member]
Other assets [Abstract]
Derivatives	(15,791)	[2]	(15,829)	[2]
Other liabilities [Abstract]
Derivatives	(22,046)	[2]	(21,898)	[2]
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Mortgage Commitment Derivatives [Member]
Other assets [Abstract]
Derivatives	0		0
Other liabilities [Abstract]
Derivatives	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Fannie Mae [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Freddie Mac [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Ginnie Mae [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Alt-A private-label securities [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Subprime private-label securities [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | CMBS [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Mortgage revenue bonds [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Other [Member]
Assets [Abstract]
Trading securities	0		0
Available-for-sale securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | U.S. Treasury Securities [Member]
Assets [Abstract]
Trading securities	0		0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Asset-Backed Securities [Member]
Assets [Abstract]
Trading securities			0
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member]
Assets [Abstract]
Cash equivalents	1,150	[1]	600	[1]
Trading securities	40,695		74,198
Available-for-sale securities	63,181		77,582
Other assets [Abstract]
Derivatives	435		561
Total assets at fair value	116,261		156,552
Liabilities [Abstract]
Long-term debt	12,440		4,777
Other liabilities [Abstract]
Derivatives	705		916
Total liabilities at fair value	13,145		5,693
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Swap [Member]
Other assets [Abstract]
Derivatives	12,370		9,417
Other liabilities [Abstract]
Derivatives	19,990		18,828
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Swaption [Member]
Other assets [Abstract]
Derivatives	3,674		6,536
Other liabilities [Abstract]
Derivatives	2,463		3,432
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Other [Member]
Other assets [Abstract]
Derivatives	26		52
Other liabilities [Abstract]
Derivatives	1
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Netting adjustment [Member]
Other assets [Abstract]
Derivatives	(15,791)		(15,829)
Other liabilities [Abstract]
Derivatives	(22,046)		(21,898)
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Mortgage Commitment Derivatives [Member]
Other assets [Abstract]
Derivatives	156		385
Other liabilities [Abstract]
Derivatives	297		554
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Fannie Mae [Member]
Assets [Abstract]
Trading securities	6,248		7,424
Available-for-sale securities	10,435		16,850
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Freddie Mac [Member]
Assets [Abstract]
Trading securities	2,793		2,732
Available-for-sale securities	9,380		12,823
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Ginnie Mae [Member]
Assets [Abstract]
Trading securities	437		287
Available-for-sale securities	751		902
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Alt-A private-label securities [Member]
Assets [Abstract]
Trading securities	1,330		1,349
Available-for-sale securities	11,075		11,683
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Subprime private-label securities [Member]
Assets [Abstract]
Trading securities	1,319		1,280
Available-for-sale securities	7,447		7,586
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | CMBS [Member]
Assets [Abstract]
Trading securities	9,826		10,411
Available-for-sale securities	13,097		14,026
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Mortgage revenue bonds [Member]
Assets [Abstract]
Trading securities	675		724
Available-for-sale securities	7,842		10,254
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Other [Member]
Assets [Abstract]
Trading securities	117		143
Available-for-sale securities	3,154		3,458
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | U.S. Treasury Securities [Member]
Assets [Abstract]
Trading securities	17,950		47,737
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Asset-Backed Securities [Member]
Assets [Abstract]
Trading securities			2,111
Fannie Mae [Member]
Liabilities [Abstract]
Long-term debt	793		838
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Mortgage loans held for investment	0
Liabilities [Abstract]
Long-term debt	0
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Mortgage loans held for investment	39,018
Liabilities [Abstract]
Long-term debt	534,516
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Mortgage loans held for investment	232,170
Liabilities [Abstract]
Long-term debt	1,056
Fannie Mae [Member] | Netting Adjustment [Member]
Assets [Abstract]
Mortgage loans held for investment	0
Liabilities [Abstract]
Long-term debt	0
Fannie Mae [Member] | Estimated Fair Value [Member]
Assets [Abstract]
Mortgage loans held for investment	271,188		294,996
Liabilities [Abstract]
Long-term debt	535,572		613,983
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Senior Fixed [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Senior Floating [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities [Abstract]
Long-term debt	393		432
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Senior Fixed [Member]
Liabilities [Abstract]
Long-term debt	393		432
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Senior Floating [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities [Abstract]
Long-term debt	400		406
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Senior Fixed [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Senior Floating [Member]
Liabilities [Abstract]
Long-term debt	400		406
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Netting Adjustment [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Senior Fixed [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Senior Floating [Member]
Liabilities [Abstract]
Long-term debt	0		0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member]
Liabilities [Abstract]
Long-term debt	793		838
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Senior Fixed [Member]
Liabilities [Abstract]
Long-term debt	393		432
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Senior Floating [Member]
Liabilities [Abstract]
Long-term debt	400		406
Consolidated Trusts [Member]
Assets [Abstract]
Mortgage loans held for investment	10,800		3,611
Liabilities [Abstract]
Long-term debt	11,647		3,939
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Mortgage loans held for investment	0
Liabilities [Abstract]
Long-term debt	0
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Mortgage loans held for investment	2,528,004
Liabilities [Abstract]
Long-term debt	2,685,008
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Mortgage loans held for investment	234,424
Liabilities [Abstract]
Long-term debt	16,171
Consolidated Trusts [Member] | Netting Adjustment [Member]
Assets [Abstract]
Mortgage loans held for investment	0
Liabilities [Abstract]
Long-term debt	0
Consolidated Trusts [Member] | Estimated Fair Value [Member]
Assets [Abstract]
Mortgage loans held for investment	2,762,428		2,652,025
Liabilities [Abstract]
Long-term debt	2,701,179		2,596,657
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Mortgage loans held for investment	0		0
Liabilities [Abstract]
Long-term debt	0		0
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Mortgage loans held for investment	8,166		1,292
Liabilities [Abstract]
Long-term debt	10,519		3,174
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Mortgage loans held for investment	2,634		2,319
Liabilities [Abstract]
Long-term debt	1,128		765
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Netting Adjustment [Member]
Assets [Abstract]
Mortgage loans held for investment	0		0
Liabilities [Abstract]
Long-term debt	0		0
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member]
Assets [Abstract]
Mortgage loans held for investment	10,800		3,611
Liabilities [Abstract]
Long-term debt	$ 11,647		$ 3,939

[1] Cash equivalents are comprised of U.S. Treasuries that are classified as Level 1.

[2] Derivative contracts are reported on a gross basis by level. The netting adjustment represents the effect of the legal right to offset under legally enforceable master netting agreements to settle with the same counterparty on a net basis, including cash collateral posted and received.