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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 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) $ 26 $ 12 $ 13 $ (18)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 2,136 496 1,127 1,398
Total gains (losses) (realized/unrealized) Included in Net Income 14 13 32 (22)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 63 0
Sales 0 0 (21) (466)
Issues 0 0 0 0
Settlements (9) (19) (34) (58)
Transfers out of Level 3 (8) 0 (30) (388)
Transfers into Level 3 7 0 1,003 26
Ending Balance 2,140 490 2,140 490
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) 27   3 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1,871   835 0
Total gains (losses) (realized/unrealized) Included in Net Income 16   20 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0   0 0
Purchases 0   63 0
Sales 0   0 0
Issues 0   0 0
Settlements 0   (5) (1)
Transfers out of Level 3 (8)   (30) (24)
Transfers into Level 3 7   1,003 25
Ending Balance 1,886 0 1,886 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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance       0
Total gains (losses) (realized/unrealized) Included in Net Income       0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss)       0
Purchases       0
Sales       0
Issues       0
Settlements       0
Transfers out of Level 3       (1)
Transfers into Level 3       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) (1) 8 10 (32)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 264 303 271 949
Total gains (losses) (realized/unrealized) Included in Net Income (2) 8 9 (56)
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 (9) (12) (27) (44)
Transfers out of Level 3 0 0 0 (363)
Transfers into Level 3 0 0 0 0
Ending Balance 253 299 253 299
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 4 0 14
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1 193 21 449
Total gains (losses) (realized/unrealized) Included in Net Income 0 5 3 34
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 (21) (279)
Issues 0 0 0 0
Settlements 0 (7) (2) (13)
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 0 0 0 0
Ending Balance 1 191 1 191
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 1,637 2,828 2,153 8,431
Total gains (losses) (realized/unrealized) Included in Net Income 5 115 41 299
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 11 (93) (32) (230)
Purchases 0 0 0 0
Sales (59) (324) (384) (2,415)
Issues 0 0 0 0
Settlements (91) (142) (254) (575)
Transfers out of Level 3 (16) 0 (67) (3,127)
Transfers into Level 3 8 1 38 2
Ending Balance 1,495 2,385 1,495 2,385
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 206   230 0
Total gains (losses) (realized/unrealized) Included in Net Income 0   1 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0   (2) 0
Purchases 0   0 0
Sales 0   0 0
Issues 0   0 0
Settlements (2)   (8) 0
Transfers out of Level 3 (16)   (63) (1)
Transfers into Level 3 8   38 1
Ending Balance 196 0 196 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   1 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   0 (4) (3)
Transfers into Level 3   1 0 1
Ending Balance 0 2 0 2
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 178 348 217 4,322
Total gains (losses) (realized/unrealized) Included in Net Income 0 80 0 184
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 10 (76) (5) (235)
Purchases 0 0 0 0
Sales 0 (123) 0 (998)
Issues 0 0 0 0
Settlements (8) (7) (32) (212)
Transfers out of Level 3 0 0 0 (2,839)
Transfers into Level 3 0 0 0 0
Ending Balance 180 222 180 222
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 873 2,029 1,272 2,701
Total gains (losses) (realized/unrealized) Included in Net Income 5 35 40 115
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (3) (23) (15) 25
Purchases 0 0 0 0
Sales (59) (201) (383) (812)
Issues 0 0 0 0
Settlements (67) (115) (165) (304)
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 0 0 0 0
Ending Balance 749 1,725 749 1,725
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 380 450 429 1,404
Total gains (losses) (realized/unrealized) Included in Net Income 0 0 0 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 4 6 (10) (20)
Purchases 0 0 0 0
Sales 0 0 0 (605)
Issues 0 0 0 0
Settlements (14) (20) (49) (59)
Transfers out of Level 3 0 0 0 (284)
Transfers into Level 3 0 0 0 0
Ending Balance 370 436 370 436
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) 6 6 21 24
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1,119 1,280 1,197 1,477
Total gains (losses) (realized/unrealized) Included in Net Income 9 23 41 139
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 4 0 29
Sales 0 (72) 0 (392)
Issues 0 0 0 0
Settlements (58) (60) (175) (199)
Transfers out of Level 3 (6) (17) (73) (101)
Transfers into Level 3 26 15 100 220
Ending Balance 1,090 1,173 1,090 1,173
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) (14) (18) 3 41
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 124 248 44 157
Total gains (losses) (realized/unrealized) Included in Net Income 18 11 118 243
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 (1) 0 (8)
Settlements (16) (43) (40) (176)
Transfers out of Level 3 0 0 5 (2)
Transfers into Level 3 (1) 1 (2) 2
Ending Balance 125 216 125 216
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) (9) (9) (28) (59)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (1,125) (736) (588) (865)
Total gains (losses) (realized/unrealized) Included in Net Income (6) (11) (28) (127)
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 (16) (2) (70)
Settlements 33 11 52 329
Transfers out of Level 3 141 95 229 140
Transfers into Level 3 (117) (64) (737) (128)
Ending Balance (1,074) (721) (1,074) (721)
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) 0 (6) (9)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (760) (326) (241) (496)
Total gains (losses) (realized/unrealized) Included in Net Income (2) (2) (6) (77)
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 (16) (2) (70)
Settlements 33 11 52 329
Transfers out of Level 3 141 95 229 140
Transfers into Level 3 (117) (64) (737) (128)
Ending Balance (705) (302) (705) (302)
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) (4) (9) (22) (50)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (365) (410) (347) (369)
Total gains (losses) (realized/unrealized) Included in Net Income (4) (9) (22) (50)
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 $ (369) $ (419) $ (369) $ (419)