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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Trading securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ 2 $ 33 $ 13 $ (30)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1,148 677 1,127 1,398
Total gains (losses) (realized/unrealized) Included in Net Income 7 44 18 (35)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 63 0 63 0
Sales (21) (184) (21) (466)
Issues 0 0 0 0
Settlements (14) (16) (25) (39)
Transfers out of Level 3 (21) (25) (22) (388)
Transfers into Level 3 974 0 996 26
Ending Balance 2,136 496 2,136 496
Trading securities [Member] | Fannie Mae [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 2 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 856 25 835 0
Total gains (losses) (realized/unrealized) Included in Net Income 1 0 4 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 63 0 63 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (2) (1) (5) (1)
Transfers out of Level 3 (21) (24) (22) (24)
Transfers into Level 3 974 0 996 25
Ending Balance 1,871 0 1,871 0
Trading securities [Member] | Other agency [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0   0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   1   0
Total gains (losses) (realized/unrealized) Included in Net Income   0   0
Total gains (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)   (1)
Transfers into Level 3   0   1
Ending Balance   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]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 2 27 11 (40)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 272 288 271 949
Total gains (losses) (realized/unrealized) Included in Net Income 3 27 11 (64)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 (187)
Issues 0 0 0 0
Settlements (11) (12) (18) (32)
Transfers out of Level 3 0 0 0 (363)
Transfers into Level 3 0 0 0 0
Ending Balance 264 303 264 303
Trading securities [Member] | Mortgage revenue bonds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 6 0 10
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 20 363 21 449
Total gains (losses) (realized/unrealized) Included in Net Income 3 17 3 29
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales (21) (184) (21) (279)
Issues 0 0 0 0
Settlements (1) (3) (2) (6)
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 0 0 0 0
Ending Balance 1 193 1 193
Available-for-sale securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 2,039 3,621 2,153 8,431
Total gains (losses) (realized/unrealized) Included in Net Income 34 80 36 184
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (54) 26 (43) (137)
Purchases 0 0 0 0
Sales (312) (769) (325) (2,091)
Issues 0 0 0 0
Settlements (49) (128) (163) (433)
Transfers out of Level 3 (21) (2) (51) (3,127)
Transfers into Level 3 0 0 30 1
Ending Balance 1,637 2,828 1,637 2,828
Available-for-sale securities [Member] | Fannie Mae [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 232 1 230 0
Total gains (losses) (realized/unrealized) Included in Net Income 0 0 1 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (3) 0 (2) 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (2) 0 (6) 0
Transfers out of Level 3 (21) (1) (47) (1)
Transfers into Level 3 0 0 30 1
Ending Balance 206 0 206 0
Available-for-sale securities [Member] | Other agency [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)   0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   2 5 4
Total gains (losses) (realized/unrealized) Included in Net Income   0 0 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss)   0 0 0
Purchases   0 0 0
Sales   0 (1) 0
Issues   0 0 0
Settlements   0 0 0
Transfers out of Level 3   (1) (4) (3)
Transfers into Level 3   0 0 0
Ending Balance 0 1 0 1
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]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 205 399 217 4,322
Total gains (losses) (realized/unrealized) Included in Net Income 0 1 0 104
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (21) 9 (15) (159)
Purchases 0 0 0 0
Sales 0 0 0 (875)
Issues 0 0 0 0
Settlements (6) (61) (24) (205)
Transfers out of Level 3 0 0 0 (2,839)
Transfers into Level 3 0 0 0 0
Ending Balance 178 348 178 348
Available-for-sale securities [Member] | Mortgage revenue bonds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1,185 2,564 1,272 2,701
Total gains (losses) (realized/unrealized) Included in Net Income 34 76 35 80
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (11) 18 (12) 48
Purchases 0 0 0 0
Sales (312) (568) (324) (611)
Issues 0 0 0 0
Settlements (23) (61) (98) (189)
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 0 0 0 0
Ending Balance 873 2,029 873 2,029
Available-for-sale securities [Member] | Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 417 655 429 1,404
Total gains (losses) (realized/unrealized) Included in Net Income 0 3 0 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (19) (1) (14) (26)
Purchases 0 0 0 0
Sales 0 (201) 0 (605)
Issues 0 0 0 0
Settlements (18) (6) (35) (39)
Transfers out of Level 3 0 0 0 (284)
Transfers into Level 3 0 0 0 0
Ending Balance 380 450 380 450
Mortgage loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 19 10 16 20
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1,149 1,311 1,197 1,477
Total gains (losses) (realized/unrealized) Included in Net Income 24 15 32 116
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 25 0 25
Sales 0 0 0 (320)
Issues 0 0 0 0
Settlements (55) (67) (117) (139)
Transfers out of Level 3 (21) (19) (67) (84)
Transfers into Level 3 22 15 74 205
Ending Balance 1,119 1,280 1,119 1,280
Net derivatives [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 9 41 0 76
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 113 231 44 157
Total gains (losses) (realized/unrealized) Included in Net Income 27 52 100 232
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 (3) 0 (7)
Settlements (16) (33) (24) (133)
Transfers out of Level 3 0 0 5 (2)
Transfers into Level 3 0 1 (1) 1
Ending Balance 124 248 124 248
Long-term debt [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (19) (22) (22) (49)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (564) (641) (588) (865)
Total gains (losses) (realized/unrealized) Included in Net Income (20) (22) (22) (116)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 (47) (2) (54)
Settlements 12 9 19 318
Transfers out of Level 3 22 8 88 45
Transfers into Level 3 (575) (43) (620) (64)
Ending Balance (1,125) (736) (1,125) (736)
Long-term debt [Member] | Consolidated Trusts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (5) (7) (4) (8)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (214) (246) (241) (496)
Total gains (losses) (realized/unrealized) Included in Net Income (5) (7) (4) (75)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 (47) (2) (54)
Settlements 12 9 19 318
Transfers out of Level 3 22 8 88 45
Transfers into Level 3 (575) (43) (620) (64)
Ending Balance (760) (326) (760) (326)
Long-term debt [Member] | Senior floating [Member] | Fannie Mae [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (14) (15) (18) (41)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (350) (395) (347) (369)
Total gains (losses) (realized/unrealized) Included in Net Income (15) (15) (18) (41)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements 0 0 0 0
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 0 0 0 0
Ending Balance $ (365) $ (410) $ (365) $ (410)