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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 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) $ 11 $ (57)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,127 1,398
Total gains (losses) (realized/unrealized) Included in Net Income 11 (79)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 (282)
Issues 0 0
Settlements (11) (23)
Transfers out of Level 3 (1) (363)
Transfers into Level 3 22 26
Ending Balance 1,148 677
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) 3 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 835 0
Total gains (losses) (realized/unrealized) Included in Net Income 3 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (3) 0
Transfers out of Level 3 (1) 0
Transfers into Level 3 22 25
Ending Balance 856 25
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   0
Transfers into Level 3   1
Ending Balance   1
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) 8 (67)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 271 949
Total gains (losses) (realized/unrealized) Included in Net Income 8 (91)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 (187)
Issues 0 0
Settlements (7) (20)
Transfers out of Level 3 0 (363)
Transfers into Level 3 0 0
Ending Balance 272 288
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 10
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 21 449
Total gains (losses) (realized/unrealized) Included in Net Income 0 12
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 (95)
Issues 0 0
Settlements (1) (3)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 20 363
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 2,153 8,431
Total gains (losses) (realized/unrealized) Included in Net Income 2 104
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 11 (163)
Purchases 0 0
Sales (13) (1,322)
Issues 0 0
Settlements (114) (305)
Transfers out of Level 3 (30) (3,125)
Transfers into Level 3 30 1
Ending Balance 2,039 3,621
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 230 0
Total gains (losses) (realized/unrealized) Included in Net Income 1 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 1 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (4) 0
Transfers out of Level 3 (26) 0
Transfers into Level 3 30 1
Ending Balance 232 1
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 5 4
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 (1) 0
Issues 0 0
Settlements 0 0
Transfers out of Level 3 (4) (2)
Transfers into Level 3 0 0
Ending Balance 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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 217 4,322
Total gains (losses) (realized/unrealized) Included in Net Income 0 103
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 6 (168)
Purchases 0 0
Sales 0 (875)
Issues 0 0
Settlements (18) (144)
Transfers out of Level 3 0 (2,839)
Transfers into Level 3 0 0
Ending Balance 205 399
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 1,272 2,701
Total gains (losses) (realized/unrealized) Included in Net Income 1 4
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (1) 30
Purchases 0 0
Sales (12) (43)
Issues 0 0
Settlements (75) (128)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 1,185 2,564
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 429 1,404
Total gains (losses) (realized/unrealized) Included in Net Income 0 (3)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 5 (25)
Purchases 0 0
Sales 0 (404)
Issues 0 0
Settlements (17) (33)
Transfers out of Level 3 0 (284)
Transfers into Level 3 0 0
Ending Balance 417 655
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) (1) 13
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,197 1,477
Total gains (losses) (realized/unrealized) Included in Net Income 8 101
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 (320)
Issues 0 0
Settlements (62) (72)
Transfers out of Level 3 (46) (65)
Transfers into Level 3 52 190
Ending Balance 1,149 1,311
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) 66
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 44 157
Total gains (losses) (realized/unrealized) Included in Net Income 73 180
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 (4)
Settlements (8) (100)
Transfers out of Level 3 5 (2)
Transfers into Level 3 (1) 0
Ending Balance 113 231
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) (2) (28)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (588) (865)
Total gains (losses) (realized/unrealized) Included in Net Income (2) (94)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues (2) (7)
Settlements 7 309
Transfers out of Level 3 66 37
Transfers into Level 3 (45) (21)
Ending Balance (564) (641)
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 (2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (241) (496)
Total gains (losses) (realized/unrealized) Included in Net Income 1 (68)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues (2) (7)
Settlements 7 309
Transfers out of Level 3 66 37
Transfers into Level 3 (45) (21)
Ending Balance (214) (246)
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) (3) (26)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (347) (369)
Total gains (losses) (realized/unrealized) Included in Net Income (3) (26)
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 $ (350) $ (395)