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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
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) $ 1 $ 11
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,201 1,127
Total gains (losses) (realized/unrealized) Included in Net Income 85 11
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 1 0
Sales (1,060) 0
Issues 0 0
Settlements (6) (11)
Transfers out of Level 3 (137) (1)
Transfers into Level 3 0 22
Ending Balance 84 1,148
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) 1 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 971 835
Total gains (losses) (realized/unrealized) Included in Net Income 171 3
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 1 0
Sales (1,060) 0
Issues 0 0
Settlements 0 (3)
Transfers out of Level 3 0 (1)
Transfers into Level 3 0 22
Ending Balance 83 856
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 35  
Total gains (losses) (realized/unrealized) Included in Net Income (1)  
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0  
Purchases 0  
Sales 0  
Issues 0  
Settlements 1  
Transfers out of Level 3 33  
Transfers into Level 3 0  
Ending Balance 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) 0 8
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 194 271
Total gains (losses) (realized/unrealized) Included in Net Income (85) 8
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (5) (7)
Transfers out of Level 3 (104) 0
Transfers into Level 3 0 0
Ending Balance 0 272
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 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1 21
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 (1)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 1 20
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,313 2,153
Total gains (losses) (realized/unrealized) Included in Net Income 18 2
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (64) 11
Purchases 0 0
Sales (11) (13)
Issues 0 0
Settlements (133) (114)
Transfers out of Level 3 (4) (30)
Transfers into Level 3 0 30
Ending Balance 1,119 2,309
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 208 230
Total gains (losses) (realized/unrealized) Included in Net Income 0 1
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (4) 1
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (2) (4)
Transfers out of Level 3 0 (26)
Transfers into Level 3 0 30
Ending Balance 202 232
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance   5
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   (1)
Issues   0
Settlements   0
Transfers out of Level 3   (4)
Transfers into Level 3   0
Ending Balance   0
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 77 217
Total gains (losses) (realized/unrealized) Included in Net Income 0 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (45) 6
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (1) (18)
Transfers out of Level 3 (4) 0
Transfers into Level 3 0 0
Ending Balance 27 205
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 671 1,272
Total gains (losses) (realized/unrealized) Included in Net Income 11 1
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (13) (1)
Purchases 0 0
Sales (11) (12)
Issues 0 0
Settlements (119) (75)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 539 1,185
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 357 429
Total gains (losses) (realized/unrealized) Included in Net Income 7 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (2) 5
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (11) (17)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 351 417
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) 11 (1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,116 1,197
Total gains (losses) (realized/unrealized) Included in Net Income 17 8
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (48) (62)
Transfers out of Level 3 (36) (46)
Transfers into Level 3 53 52
Ending Balance 1,102 1,149
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) (22) (9)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 134 44
Total gains (losses) (realized/unrealized) Included in Net Income (58) 73
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 4 (8)
Transfers out of Level 3 53 5
Transfers into Level 3 0 (1)
Ending Balance 133 113
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) 20 (2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (958) (588)
Total gains (losses) (realized/unrealized) Included in Net Income 22 (2)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 1 2
Settlements 10 7
Transfers out of Level 3 154 66
Transfers into Level 3 (48) (45)
Ending Balance (819) (564)
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) 1 1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (582) (241)
Total gains (losses) (realized/unrealized) Included in Net Income 3 1
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 1 2
Settlements 10 7
Transfers out of Level 3 154 66
Transfers into Level 3 (48) (45)
Ending Balance (462) (214)
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) 19 (3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (376) (347)
Total gains (losses) (realized/unrealized) Included in Net Income 19 (3)
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 0 0
Transfers into Level 3 0 0
Ending Balance $ (357) $ (350)