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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 11 $ (3) $ (8)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,127 1,398 3,030
Total gains or (losses) (realized/unrealized) Included in Net Income 59 0 8
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 99 0 0
Sales (81) (679) (1,200)
Issues 0 0 0
Settlements (39) (65) (148)
Transfers out of Level 3 (991) (388) (322)
Transfers into Level 3 1,027 861 30
Ending Balance 1,201 1,127 1,398
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 6 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 835 0 305
Total gains or (losses) (realized/unrealized) Included in Net Income 41 0 (27)
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 64 0 0
Sales 0 0 (2)
Issues 0 0 0
Settlements (5) (1) 0
Transfers out of Level 3 (991) (24) (278)
Transfers into Level 3 1,027 860 2
Ending Balance 971 835 0
Trading securities [Member] | Other agency [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  
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 35 0  
Sales 0 0  
Issues 0 0  
Settlements 0 0  
Transfers out of Level 3 0 (1)  
Transfers into Level 3 0 1  
Ending Balance 35 0 0
Trading securities [Member] | Alt-A and 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 5 (1) 25
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 271 949 1,904
Total gains or (losses) (realized/unrealized) Included in Net Income 15 (33) 72
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales (60) (231) (878)
Issues 0 0 0
Settlements (32) (51) (133)
Transfers out of Level 3 0 (363) (44)
Transfers into Level 3 0 0 28
Ending Balance 194 271 949
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 0 (2) (33)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 21 449 722
Total gains or (losses) (realized/unrealized) Included in Net Income 3 33 (41)
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales (21) (448) (220)
Issues 0 0 0
Settlements (2) (13) (12)
Transfers out of Level 3 0 0 0
Transfers into Level 3 0 0 0
Ending Balance 1 21 449
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance   0 99
Total gains or (losses) (realized/unrealized) Included in Net Income     4
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss)     0
Purchases     0
Sales     (100)
Issues     0
Settlements     (3)
Transfers out of Level 3     0
Transfers into Level 3     0
Ending Balance     0
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 2,153 8,431 15,080
Total gains or (losses) (realized/unrealized) Included in Net Income 99 316 839
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (76) (279) (661)
Purchases 0 0 421
Sales (503) (2,731) (4,926)
Issues 0 0 0
Settlements (342) (692) (2,132)
Transfers out of Level 3 (76) (3,128) (540)
Transfers into Level 3 58 236 350
Ending Balance 1,313 2,153 8,431
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 230 0 0
Total gains or (losses) (realized/unrealized) Included in Net Income 2 0 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (1) 0 0
Purchases 0 0 421
Sales 0 0 (425)
Issues 0 0 0
Settlements (9) 0 (8)
Transfers out of Level 3 (72) (1) 0
Transfers into Level 3 58 231 12
Ending Balance 208 230 0
Available-for-sale securities [Member] | Other agency [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 5 4 6
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 (1) 0 0
Issues 0 0 0
Settlements 0 0 (1)
Transfers out of Level 3 (4) (4) (2)
Transfers into Level 3 0 5 1
Ending Balance 0 5 4
Available-for-sale securities [Member] | Alt-A and 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 217 4,322 8,380
Total gains or (losses) (realized/unrealized) Included in Net Income 54 184 814
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (53) (233) (555)
Purchases 0 0 0
Sales (105) (997) (3,079)
Issues 0 0 0
Settlements (36) (220) (1,037)
Transfers out of Level 3 0 (2,839) (538)
Transfers into Level 3 0 0 337
Ending Balance 77 217 4,322
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 1,272 2,701 4,023
Total gains or (losses) (realized/unrealized) Included in Net Income 35 132 51
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (11) (34) (104)
Purchases 0 0 0
Sales (392) (1,129) (410)
Issues 0 0 0
Settlements (233) (398) (859)
Transfers out of Level 3 0 0 0
Transfers into Level 3 0 0 0
Ending Balance 671 1,272 2,701
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 429 1,404 2,671
Total gains or (losses) (realized/unrealized) Included in Net Income 8 0 (26)
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (11) (12) (2)
Purchases 0 0 0
Sales (5) (605) (1,012)
Issues 0 0 0
Settlements (64) (74) (227)
Transfers out of Level 3 0 (284) 0
Transfers into Level 3 0 0 0
Ending Balance 357 429 1,404
Mortgage loans [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 25 17 (20)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,197 1,477 1,833
Total gains or (losses) (realized/unrealized) Included in Net Income 45 129 57
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 5 36 5
Sales 0 (392) 0
Issues 0 0 0
Settlements (233) (255) (350)
Transfers out of Level 3 (70) (77) (377)
Transfers into Level 3 172 279 309
Ending Balance 1,116 1,197 1,477
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 13 (132) (2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 44 157 45
Total gains or (losses) (realized/unrealized) Included in Net Income 111 15 (55)
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 (8) (4)
Settlements (22) (122) 169
Transfers out of Level 3 6 2 (7)
Transfers into Level 3 (5) 0 9
Ending Balance 134 44 157
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 (40) 13 11
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (588) (865) (890)
Total gains (losses) (realized/unrealized) Included in Net Income (38) (53) (15)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (2) (74) (66)
Settlements 66 378 57
Transfers out of Level 3 388 215 228
Transfers Into Level 3 (784) (189) (179)
Ending Balance (958) (588) (865)
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 (11) (9) 17
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (241) (496) (527)
Total gains (losses) (realized/unrealized) Included in Net Income (9) (75) (9)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (2) (74) (66)
Settlements 66 378 57
Transfers out of Level 3 388 215 228
Transfers Into Level 3 (784) (189) (179)
Ending Balance (582) (241) (496)
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 (29) 22 (6)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (347) (369) (363)
Total gains (losses) (realized/unrealized) Included in Net Income (29) 22 (6)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements 0 0 0
Transfers out of Level 3 0 0 0
Transfers Into Level 3 0 0 0
Ending Balance $ (376) $ (347) $ (369)