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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Trading securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held $ (3) $ (8) $ 486
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,398 3,030 2,774
Total gains or (losses) (realized/unrealized) Included in Net Income 0 8 512
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 6
Sales (679) (1,200) (299)
Issues 0 0 0
Settlements (65) (148) (277)
Transfers out of Level 3 (388) (322) (267)
Transfers into Level 3 861 30 581
Ending Balance 1,127 1,398 3,030
Trading securities [Member] | Fannie Mae [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 (18)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 305 42
Total gains or (losses) (realized/unrealized) Included in Net Income 0 (27) (27)
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 6
Sales 0 (2) 0
Issues 0 0 0
Settlements (1) 0 (2)
Transfers out of Level 3 (24) (278) (39)
Transfers into Level 3 860 2 325
Ending Balance 835 0 305
Trading securities [Member] | Freddie Mac [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0   0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 0 2
Total gains or (losses) (realized/unrealized) Included in Net Income 0   0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0   0
Purchases 0   0
Sales 0   0
Issues 0   0
Settlements 0   0
Transfers out of Level 3 (1)   (2)
Transfers into Level 3 1   0
Ending Balance 0 0 0
Trading securities [Member] | Alt-A private-label securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held (1) 15 97
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 305 597 618
Total gains or (losses) (realized/unrealized) Included in Net Income (1) 36 88
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales 0 (267) (58)
Issues 0 0 0
Settlements (33) (45) (81)
Transfers out of Level 3 0 (44) (226)
Transfers into Level 3 0 28 256
Ending Balance 271 305 597
Trading securities [Member] | Subprime private-label securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 10 234
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 644 1,307 1,448
Total gains or (losses) (realized/unrealized) Included in Net Income (32) 36 270
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales (231) (611) (241)
Issues 0 0 0
Settlements (18) (88) (170)
Transfers out of Level 3 (363) 0 0
Transfers into Level 3 0 0 0
Ending Balance 0 644 1,307
Trading securities [Member] | Mortgage revenue bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held (2) (33) 160
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 449 722 565
Total gains or (losses) (realized/unrealized) Included in Net Income 33 (41) 168
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales (448) (220) 0
Issues 0 0 0
Settlements (13) (12) (11)
Transfers out of Level 3 0 0 0
Transfers into Level 3 0 0 0
Ending Balance 21 449 722
Trading securities [Member] | Other [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held   0 13
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 99 99
Total gains or (losses) (realized/unrealized) Included in Net Income   4 13
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss)   0 0
Purchases   0 0
Sales   (100) 0
Issues   0 0
Settlements   (3) (13)
Transfers out of Level 3   0 0
Transfers into Level 3   0 0
Ending Balance   0 99
Available-for-sale securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 8,431 15,080 19,012
Total gains or (losses) (realized/unrealized) Included in Net Income 316 839 606
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (279) (661) 932
Purchases 0 421 0
Sales (2,731) (4,926) (2,193)
Issues 0 0 0
Settlements (692) (2,132) (3,337)
Transfers out of Level 3 (3,128) (540) (1,748)
Transfers into Level 3 236 350 1,808
Ending Balance 2,153 8,431 15,080
Available-for-sale securities [Member] | Fannie Mae [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 0 7
Total gains or (losses) (realized/unrealized) Included in Net Income 0 0 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 421 0
Sales 0 (425) 0
Issues 0 0 0
Settlements 0 (8) (1)
Transfers out of Level 3 (1) 0 (8)
Transfers into Level 3 231 12 2
Ending Balance 230 0 0
Available-for-sale securities [Member] | Freddie Mac [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 4 6 8
Total gains or (losses) (realized/unrealized) Included in Net Income 0 0 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements 0 (1) (1)
Transfers out of Level 3 (4) (2) (2)
Transfers into Level 3 5 1 1
Ending Balance 5 4 6
Available-for-sale securities [Member] | Alt-A private-label securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,041 3,140 3,791
Total gains or (losses) (realized/unrealized) Included in Net Income 14 215 172
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (24) (173) (26)
Purchases 0 0 0
Sales (291) (1,504) (393)
Issues 0 0 0
Settlements (52) (436) (471)
Transfers out of Level 3 (516) (538) (1,738)
Transfers into Level 3 0 337 1,805
Ending Balance 172 1,041 3,140
Available-for-sale securities [Member] | Subprime private-label securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 3,281 5,240 7,068
Total gains or (losses) (realized/unrealized) Included in Net Income 170 599 447
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (209) (382) 301
Purchases 0 0 0
Sales (706) (1,575) (1,730)
Issues 0 0 0
Settlements (168) (601) (846)
Transfers out of Level 3 (2,323) 0 0
Transfers into Level 3 0 0 0
Ending Balance 45 3,281 5,240
Available-for-sale securities [Member] | Mortgage revenue bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 2,701 4,023 5,253
Total gains or (losses) (realized/unrealized) Included in Net Income 132 51 (32)
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (34) (104) 554
Purchases 0 0 0
Sales (1,129) (410) (70)
Issues 0 0 0
Settlements (398) (859) (1,682)
Transfers out of Level 3 0 0 0
Transfers into Level 3 0 0 0
Ending Balance 1,272 2,701 4,023
Available-for-sale securities [Member] | Other [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,404 2,671 2,885
Total gains or (losses) (realized/unrealized) Included in Net Income 0 (26) 19
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (12) (2) 103
Purchases 0 0 0
Sales (605) (1,012) 0
Issues 0 0 0
Settlements (74) (227) (336)
Transfers out of Level 3 (284) 0 0
Transfers into Level 3 0 0 0
Ending Balance 429 1,404 2,671
Mortgage loans [Member] | Consolidated Trusts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 17 (20) 53
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,477 1,833 2,704
Total gains or (losses) (realized/unrealized) Included in Net Income 129 57 260
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 36 5 36
Sales (392) 0 0
Issues 0 0 0
Settlements (255) (350) (344)
Transfers out of Level 3 (77) (377) (1,113)
Transfers into Level 3 279 309 290
Ending Balance 1,197 1,477 1,833
Net derivatives [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held (132) (2) 77
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 157 45 (40)
Total gains or (losses) (realized/unrealized) Included in Net Income 15 (55) 103
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (8) (4) 0
Settlements (122) 169 (21)
Transfers out of Level 3 2 (7) (2)
Transfers into Level 3 0 9 5
Ending Balance 44 157 45
Long-term debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net unrealized Gains (Losses) included in net income related to liabilities still held 13 11 (146)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (865) (890) (1,473)
Total gains (losses) (realized/unrealized) Included in Net Income (53) (15) (195)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (74) (66) (751)
Settlements 378 57 81
Transfers out of Level 3 215 228 1,576
Transfers Into Level 3 (189) (179) (128)
Ending Balance (588) (865) (890)
Long-term debt [Member] | Consolidated Trusts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net unrealized Gains (Losses) included in net income related to liabilities still held (9) 17 (49)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (496) (527) (518)
Total gains (losses) (realized/unrealized) Included in Net Income (75) (9) (53)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (74) (66) (1)
Settlements 378 57 62
Transfers out of Level 3 215 228 111
Transfers Into Level 3 (189) (179) (128)
Ending Balance (241) (496) (527)
Long-term debt [Member] | Senior floating [Member] | Fannie Mae [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net unrealized Gains (Losses) included in net income related to liabilities still held 22 (6) (97)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (369) (363) (955)
Total gains (losses) (realized/unrealized) Included in Net Income 22 (6) (142)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 (750)
Settlements 0 0 19
Transfers out of Level 3 0 0 1,465
Transfers Into Level 3 0 0 0
Ending Balance $ (347) $ (369) $ (363)