XML 32 R87.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value Recurring Changes in Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Assets [Abstract]    
Trading securities $ 19,897  
Available-for-sale securities 0  
Mortgage loans held for investment 0  
Other assets [Abstract]    
Derivatives assets at fair value 0  
Total assets at fair value 91,715  
Other liabilities [Abstract]    
Derivatives 0  
Total liabilities at fair value 0  
Significant Other Observable Inputs (Level 2) [Member]
   
Assets [Abstract]    
Trading securities 20,052  
Available-for-sale securities 40,512  
Mortgage loans held for investment 2,563,347  
Other assets [Abstract]    
Derivatives assets at fair value 17,957  
Total assets at fair value 2,702,156  
Other liabilities [Abstract]    
Derivatives 26,462  
Total liabilities at fair value 3,383,633  
Significant Unobservable Inputs (Level 3) [Member]
   
Assets [Abstract]    
Trading securities 2,573  
Available-for-sale securities 25,840  
Mortgage loans held for investment 477,585  
Other assets [Abstract]    
Derivatives assets at fair value 197  
Total assets at fair value 507,693  
Other liabilities [Abstract]    
Derivatives 167  
Total liabilities at fair value 27,968  
Netting Adjustment [Member]
   
Assets [Abstract]    
Trading securities 0  
Available-for-sale securities 0  
Mortgage loans held for investment 0  
Other assets [Abstract]    
Derivatives assets at fair value (16,826)  
Total assets at fair value (16,826)  
Other liabilities [Abstract]    
Derivatives (24,596)  
Total liabilities at fair value (24,596)  
Estimated Fair Value [Member]
   
Assets [Abstract]    
Trading securities 42,522 74,198
Available-for-sale securities 66,352 77,582
Mortgage loans held for investment 3,040,932 2,947,021
Other assets [Abstract]    
Derivatives assets at fair value 1,328 561
Total assets at fair value 3,284,738 3,220,344
Other liabilities [Abstract]    
Derivatives 2,033 916
Total liabilities at fair value 3,387,005 3,367,255
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Assets [Abstract]    
Cash equivalents 2,575 [1] 600 [1]
Trading securities 19,897 47,737
Available-for-sale securities 0 0
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Total assets at fair value 22,472 48,337
Liabilities [Abstract]    
Long-term debt, Fair Value 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 assets at fair value 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 assets at fair value 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 assets at fair value 0 0
Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Netting adjustment [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 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 assets at fair value 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 19,897 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 20,052 22,223
Available-for-sale securities 40,512 48,090
Other assets [Abstract]    
Derivatives assets at fair value 17,957 16,152
Total assets at fair value 83,945 87,757
Liabilities [Abstract]    
Long-term debt, Fair Value 6,342 3,606
Other liabilities [Abstract]    
Derivatives 26,462 22,641
Total liabilities at fair value 32,804 26,247
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Swap [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 12,476 9,247
Other liabilities [Abstract]    
Derivatives 22,126 18,661
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Swaption [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 4,422 6,536
Other liabilities [Abstract]    
Derivatives 2,679 3,432
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 0 1
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Netting adjustment [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 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 assets at fair value 1,059 368
Other liabilities [Abstract]    
Derivatives 1,657 548
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fannie Mae [Member]
   
Assets [Abstract]    
Trading securities 6,169 5,687
Available-for-sale securities 11,538 15,904
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Freddie Mac [Member]
   
Assets [Abstract]    
Trading securities 2,838 2,732
Available-for-sale securities 10,180 12,811
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Ginnie Mae [Member]
   
Assets [Abstract]    
Trading securities 279 278
Available-for-sale securities 792 902
Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alt-A private-label securities [Member]
   
Assets [Abstract]    
Trading securities 846 1,004
Available-for-sale securities 4,666 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 9,920 10,411
Available-for-sale securities 13,321 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 4 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 11 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 2,573 4,238
Available-for-sale securities 25,840 29,492
Other assets [Abstract]    
Derivatives assets at fair value 197 238
Total assets at fair value 31,026 36,287
Liabilities [Abstract]    
Long-term debt, Fair Value 1,856 1,171
Other liabilities [Abstract]    
Derivatives 167 173
Total liabilities at fair value 2,023 1,344
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Swap [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 157 170
Other liabilities [Abstract]    
Derivatives 166 167
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Swaption [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 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 assets at fair value 28 51
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Netting adjustment [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 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 assets at fair value 12 17
Other liabilities [Abstract]    
Derivatives 1 6
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]
   
Assets [Abstract]    
Trading securities 76 1,737
Available-for-sale securities 32 946
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 430 345
Available-for-sale securities 6,562 7,256
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Subprime private-label securities [Member]
   
Assets [Abstract]    
Trading securities 1,265 1,280
Available-for-sale securities 7,372 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 681 724
Available-for-sale securities 8,669 10,247
Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other [Member]
   
Assets [Abstract]    
Trading securities 118 143
Available-for-sale securities 3,195 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 assets at fair value (16,826) [2] (15,829) [2]
Total assets at fair value (16,826) [2] (15,829) [2]
Liabilities [Abstract]    
Long-term debt, Fair Value 0 0
Other liabilities [Abstract]    
Derivatives (24,596) [2] (21,898) [2]
Total liabilities at fair value (24,596) [2] (21,898) [2]
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Swap [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivatives 0 0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Swaption [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Other liabilities [Abstract]    
Derivatives 0 0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Other [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 0 0
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Netting adjustment [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value (16,826) [2] (15,829) [2]
Other liabilities [Abstract]    
Derivatives (24,596) [2] (21,898) [2]
Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Mortgage Commitment Derivatives [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 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 2,575 [1] 600 [1]
Trading securities 42,522 74,198
Available-for-sale securities 66,352 77,582
Other assets [Abstract]    
Derivatives assets at fair value 1,328 561
Total assets at fair value 120,617 156,552
Liabilities [Abstract]    
Long-term debt, Fair Value 8,198 4,777
Other liabilities [Abstract]    
Derivatives 2,033 916
Total liabilities at fair value 10,231 5,693
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Swap [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 12,633 9,417
Other liabilities [Abstract]    
Derivatives 22,292 18,828
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Swaption [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 4,422 6,536
Other liabilities [Abstract]    
Derivatives 2,679 3,432
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Other [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 28 52
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Netting adjustment [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value (16,826) (15,829)
Other liabilities [Abstract]    
Derivatives (24,596) (21,898)
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Mortgage Commitment Derivatives [Member]
   
Other assets [Abstract]    
Derivatives assets at fair value 1,071 385
Other liabilities [Abstract]    
Derivatives 1,658 554
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Fannie Mae [Member]
   
Assets [Abstract]    
Trading securities 6,245 7,424
Available-for-sale securities 11,570 16,850
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Freddie Mac [Member]
   
Assets [Abstract]    
Trading securities 2,840 2,732
Available-for-sale securities 10,190 12,823
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Ginnie Mae [Member]
   
Assets [Abstract]    
Trading securities 280 287
Available-for-sale securities 792 902
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Alt-A private-label securities [Member]
   
Assets [Abstract]    
Trading securities 1,276 1,349
Available-for-sale securities 11,228 11,683
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Subprime private-label securities [Member]
   
Assets [Abstract]    
Trading securities 1,265 1,280
Available-for-sale securities 7,372 7,586
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | CMBS [Member]
   
Assets [Abstract]    
Trading securities 9,920 10,411
Available-for-sale securities 13,321 14,026
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Mortgage revenue bonds [Member]
   
Assets [Abstract]    
Trading securities 681 724
Available-for-sale securities 8,673 10,254
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Other [Member]
   
Assets [Abstract]    
Trading securities 118 143
Available-for-sale securities 3,206 3,458
Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | U.S. Treasury Securities [Member]
   
Assets [Abstract]    
Trading securities 19,897 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, Fair Value 830 838
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, Fair Value 0  
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 38,720  
Liabilities [Abstract]    
Long-term debt, Fair Value 574,091  
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 230,175  
Liabilities [Abstract]    
Long-term debt, Fair Value 1,087  
Fannie Mae [Member] | Netting Adjustment [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 0  
Liabilities [Abstract]    
Long-term debt, Fair Value 0  
Fannie Mae [Member] | Estimated Fair Value [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 268,895 294,996
Liabilities [Abstract]    
Long-term debt, Fair Value 575,178 613,983
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 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, Fair Value 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, Fair Value 0 0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 399 432
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Senior Fixed [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 399 432
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member] | Senior Floating [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 0 0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 431 406
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Senior Fixed [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 0 0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member] | Senior Floating [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 431 406
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Netting Adjustment [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 0 0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Senior Fixed [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 0 0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Netting Adjustment [Member] | Senior Floating [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 0 0
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 830 838
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Senior Fixed [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 399 432
Fannie Mae [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member] | Senior Floating [Member]
   
Liabilities [Abstract]    
Long-term debt, Fair Value 431 406
Consolidated Trusts [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 7,840 3,611
Liabilities [Abstract]    
Long-term debt, Fair Value 7,368 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, Fair Value 0  
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 2,524,627  
Liabilities [Abstract]    
Long-term debt, Fair Value 2,678,001  
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 247,410  
Liabilities [Abstract]    
Long-term debt, Fair Value 19,715  
Consolidated Trusts [Member] | Netting Adjustment [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 0  
Liabilities [Abstract]    
Long-term debt, Fair Value 0  
Consolidated Trusts [Member] | Estimated Fair Value [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 2,772,037 2,652,025
Liabilities [Abstract]    
Long-term debt, Fair Value 2,697,716 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, Fair Value 0 0
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 5,424 1,292
Liabilities [Abstract]    
Long-term debt, Fair Value 5,943 3,174
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 2,416 2,319
Liabilities [Abstract]    
Long-term debt, Fair Value 1,425 765
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, Fair Value 0 0
Consolidated Trusts [Member] | Recurring Fair Value Measurements [Member] | Estimated Fair Value [Member]
   
Assets [Abstract]    
Mortgage loans held for investment 7,840 3,611
Liabilities [Abstract]    
Long-term debt, Fair Value $ 7,368 $ 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.