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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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 $ 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 33 1,201
Total gains (losses) (realized/unrealized) Included in Net Income 2 85
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 1
Sales 0 (1,060)
Issues 0 0
Settlements (1) (6)
Transfers out of Level 3 0 (137)
Transfers into Level 3 33 0
Ending Balance 67 84
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) 2 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 32 971
Total gains (losses) (realized/unrealized) Included in Net Income 2 171
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 1
Sales 0 (1,060)
Issues 0 0
Settlements 0 0
Transfers out of Level 3 0 0
Transfers into Level 3 33 0
Ending Balance 67 83
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 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1 195
Total gains (losses) (realized/unrealized) Included in Net Income 0 (85)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (1) (5)
Transfers out of Level 3 0 (104)
Transfers into Level 3 0 0
Ending Balance 0 1
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 952 1,313
Total gains (losses) (realized/unrealized) Included in Net Income 7 18
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (1) (64)
Purchases 0 0
Sales 0 (11)
Issues 0 0
Settlements (18) (133)
Transfers out of Level 3 (41) (4)
Transfers into Level 3 85 0
Ending Balance 984 1,119
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 152 208
Total gains (losses) (realized/unrealized) Included in Net Income 0 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 4 (4)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 0 (2)
Transfers out of Level 3 (41) 0
Transfers into Level 3 84 0
Ending Balance 199 202
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 24 77
Total gains (losses) (realized/unrealized) Included in Net Income 0 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 (45)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (1) (1)
Transfers out of Level 3 0 (4)
Transfers into Level 3 0 0
Ending Balance 23 27
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 434 671
Total gains (losses) (realized/unrealized) Included in Net Income 0 11
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 (13)
Purchases 0 0
Sales 0 (11)
Issues 0 0
Settlements (9) (119)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 425 539
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 342 357
Total gains (losses) (realized/unrealized) Included in Net Income 7 7
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (5) (2)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (8) (11)
Transfers out of Level 3 0 0
Transfers into Level 3 1 0
Ending Balance 337 351
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 11
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 937 1,116
Total gains (losses) (realized/unrealized) Included in Net Income 14 17
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (34) (48)
Transfers out of Level 3 (28) (36)
Transfers into Level 3 45 53
Ending Balance 934 1,102
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) 44 (22)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 194 134
Total gains (losses) (realized/unrealized) Included in Net Income 98 (58)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (89) 4
Transfers out of Level 3 0 53
Transfers into Level 3 0 0
Ending Balance 203 133
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) (26) 20
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (552) (958)
Total gains (losses) (realized/unrealized) Included in Net Income 28 22
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances 0 1
Settlements 5 10
Transfers out of Level 3 49 154
Transfers into Level 3 (74) (48)
Ending Balance (600) (819)
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 (201) (582)
Total gains (losses) (realized/unrealized) Included in Net Income (3) 3
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances 0 1
Settlements 5 10
Transfers out of Level 3 49 154
Transfers into Level 3 (74) (48)
Ending Balance (224) (462)
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) (25) 19
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (351) (376)
Total gains (losses) (realized/unrealized) Included in Net Income (25) (19)
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances 0 0
Settlements 0 0
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance (376) (357)
Other Comprehensive Income (Loss) [Member] | 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) 0 0
Other Comprehensive Income (Loss) [Member] | 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
Other Comprehensive Income (Loss) [Member] | 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
Other Comprehensive Income (Loss) [Member] | 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 0
Other Comprehensive Income (Loss) [Member] | 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) (2) (10)
Other Comprehensive Income (Loss) [Member] | 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) 2 (3)
Other Comprehensive Income (Loss) [Member] | 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 1
Other Comprehensive Income (Loss) [Member] | 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 (8)
Other Comprehensive Income (Loss) [Member] | 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) (4) 0
Other Comprehensive Income (Loss) [Member] | 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) 0 0
Other Comprehensive Income (Loss) [Member] | 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) 0 0
Other Comprehensive Income (Loss) [Member] | 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) 0 0
Other Comprehensive Income (Loss) [Member] | 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) 0 0
Other Comprehensive Income (Loss) [Member] | 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) $ 0 $ 0