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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value $ 14,075 $ 15,629
Netting adjustment (4,024) (5,186)
Financial liabilities [Abstract]    
Netting adjustment (8,650) (10,194)
HARP Loans [Member]    
Financial liabilities [Abstract]    
Loans Receivable Refinanced under Home Affordable Refinance Program, Fair Value Disclosure 282,000 314,000
Fair Value Estimation Process [Member] | HARP Loans [Member]    
Financial liabilities [Abstract]    
Change In Estimated Fair Value Resulting From Change In Principal Market 1,100 3,300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 34,953 37,965
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 29,485 19,466
Available-for-sale securities 0 0
Mortgage loans held for sale, at lower of cost or fair value 0 0
Mortgage loans held for investment, at fair value 0 0
Advances to lenders 0 0
Derivatives assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total Financial assets 64,438 57,431
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 0 0
Derivatives liabilities at fair value 0 0
Guaranty obligations 0 0
Total Financial liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 10,600 16,600
Federal funds sold and securities purchased under agreements to resell or similar arrangements 27,350 30,950
Trading securities 9,025 9,008
Available-for-sale securities 11,799 15,574
Mortgage loans held for sale, at lower of cost or fair value 157 169
Mortgage loans held for investment, at fair value 2,702,526 2,687,759
Advances to lenders 3,902 5,079
Derivatives assets at fair value 4,729 6,489
Guaranty assets and buy-ups 0 0
Total Financial assets 2,770,088 2,771,628
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 62 50
Derivatives liabilities at fair value 9,042 10,671
Guaranty obligations 0 0
Total Financial liabilities 3,224,091 3,299,289
Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 1,398 3,030
Available-for-sale securities 8,431 15,080
Mortgage loans held for sale, at lower of cost or fair value 5,541 169
Mortgage loans held for investment, at fair value 351,355 400,327
Advances to lenders 394 470
Derivatives assets at fair value 189 182
Guaranty assets and buy-ups 544 616
Total Financial assets 367,852 419,874
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 0 0
Derivatives liabilities at fair value 32 137
Guaranty obligations 1,012 1,579
Total Financial liabilities 30,061 23,592
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 45,553 54,565
Federal funds sold and securities purchased under agreements to resell or similar arrangements 27,350 30,950
Trading securities 39,908 31,504
Available-for-sale securities 20,230 30,654
Mortgage loans held for sale, at lower of cost or fair value 5,361 331
Mortgage loans held for investment, at fair value 3,014,283 3,019,163
Advances to lenders 4,308 5,559
Derivatives assets at fair value 894 1,485
Guaranty assets and buy-ups 184 210
Total Financial assets 3,158,071 3,174,421
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 62 50
Derivatives liabilities at fair value 424 614
Guaranty obligations 329 382
Total Financial liabilities 3,198,486 3,223,201
Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 45,553 54,565
Federal funds sold and securities purchased under agreements to resell or similar arrangements 27,350 30,950
Trading securities 39,908 31,504
Available-for-sale securities 20,230 30,654
Mortgage loans held for sale, at lower of cost or fair value 5,698 338
Mortgage loans held for investment, at fair value 3,053,881 3,088,086
Advances to lenders 4,296 5,549
Derivatives assets at fair value 894 1,485
Guaranty assets and buy-ups 544 616
Total Financial assets 3,198,354 3,243,747
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 62 50
Derivatives liabilities at fair value 424 614
Guaranty obligations 1,012 1,579
Total Financial liabilities 3,245,502 3,312,687
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt, fair value 11,133 6,403
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt, fair value 0 0
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 26,544 29,896
Financial liabilities [Abstract]    
Short-term debt 71,006 105,022
Long-term debt, fair value 324,248 367,703
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 193,670 217,064
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt, fair value 898 982
Fannie Mae [Member] | Carrying Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 206,544 239,243
Financial liabilities [Abstract]    
Short-term debt 71,007 105,012
Long-term debt, fair value 315,128 355,431
Fannie Mae [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 220,214 246,960
Financial liabilities [Abstract]    
Short-term debt 71,006 105,022
Long-term debt, fair value 325,146 368,685
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt, fair value 23,609 19,483
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 0 0
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt, fair value 0 0
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,675,982 2,657,863
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt, fair value 2,819,733 2,815,843
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 157,685 183,263
Financial liabilities [Abstract]    
Short-term debt 944 1,560
Long-term debt, fair value 27,175 19,334
Consolidated Trusts [Member] | Carrying Value [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,807,739 2,779,920
Financial liabilities [Abstract]    
Short-term debt 943 1,560
Long-term debt, fair value 2,810,593 2,760,152
Consolidated Trusts [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Mortgage loans held for investment, at fair value 2,833,667 2,841,126
Financial liabilities [Abstract]    
Short-term debt 944 1,560
Long-term debt, fair value $ 2,846,908 $ 2,835,177