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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Trading Assets, Excluding Debt and Equity Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held $ 4 $ 11 $ (3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,201 1,127 1,398
Total gains or (losses) (realized/unrealized) Included in Net Income 77 59 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 1 99 0
Sales (1,059) (81) 679
Issues 0 0 0
Settlements (7) (39) 65
Transfers out of Level 3 (181) (991) 388
Transfers into Level 3 1 1,027 861
Ending Balance 33 1,201 1,127
Trading Assets, Excluding Debt and Equity Securities [Member] | Fannie Mae [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 4 6 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 971 835 0
Total gains or (losses) (realized/unrealized) Included in Net Income 163 41 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 1 64 0
Sales (1,059) 0 0
Issues 0 0 0
Settlements (1) (5) 1
Transfers out of Level 3 (44) (991) 24
Transfers into Level 3 1 1,027 860
Ending Balance 32 971 835
Trading Assets, Excluding Debt and Equity Securities [Member] | Other agency [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 35 0 0
Total gains or (losses) (realized/unrealized) Included in Net Income (1) 0 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 35 0
Sales 0 0 0
Issues 0 0 0
Settlements (1) 0 0
Transfers out of Level 3 (33) 0 (1)
Transfers into Level 3 0 0 1
Ending Balance 0 35 0
Trading Assets, Excluding Debt and Equity Securities [Member] | Alt-A and subprime private-label securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 5 (3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 195 292 1,398
Total gains or (losses) (realized/unrealized) Included in Net Income (85) 18 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales 0 (81) 679
Issues 0 0 0
Settlements (5) (34) 64
Transfers out of Level 3 (104) 0 363
Transfers into Level 3 0 0 0
Ending Balance 1 195 292
Available-for-sale securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,313 2,153 8,431
Total gains or (losses) (realized/unrealized) Included in Net Income 30 99 316
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (53) (76) (279)
Purchases 0 0 0
Sales (22) (503) 2,731
Issues 0 0 0
Settlements (263) (342) 692
Transfers out of Level 3 (53) (76) 3,128
Transfers into Level 3 0 58 236
Ending Balance 952 1,313 2,153
Available-for-sale securities [Member] | Fannie Mae [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 208 230 0
Total gains or (losses) (realized/unrealized) Included in Net Income 2 2 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 1 (1) 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements (10) (9) 0
Transfers out of Level 3 (49) (72) (1)
Transfers into Level 3 0 58 231
Ending Balance 152 208 230
Available-for-sale securities [Member] | Other agency [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held   0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 5 4
Total gains or (losses) (realized/unrealized) Included in Net Income   0 0
Total gains or (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) 4
Transfers into Level 3   0 5
Ending Balance   0 5
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]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 77 217 4,322
Total gains or (losses) (realized/unrealized) Included in Net Income 0 54 184
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (45) (53) (233)
Purchases 0 0 0
Sales 0 (105) 997
Issues 0 0 0
Settlements (4) (36) 220
Transfers out of Level 3 (4) 0 2,839
Transfers into Level 3 0 0 0
Ending Balance 24 77 217
Available-for-sale securities [Member] | Mortgage revenue bonds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 671 1,272 2,701
Total gains or (losses) (realized/unrealized) Included in Net Income 0 35 132
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (7) (11) (34)
Purchases 0 0 0
Sales (22) (392) 1,129
Issues 0 0 0
Settlements (208) (233) 398
Transfers out of Level 3 0 0 0
Transfers into Level 3 0 0 0
Ending Balance 434 671 1,272
Available-for-sale securities [Member] | Other [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 357 429 1,404
Total gains or (losses) (realized/unrealized) Included in Net Income 28 8 0
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (2) (11) (12)
Purchases 0 0 0
Sales 0 (5) 605
Issues 0 0 0
Settlements (41) (64) 74
Transfers out of Level 3 0 0 284
Transfers into Level 3 0 0 0
Ending Balance 342 357 429
Mortgage loans [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 14 25 17
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,116 1,197 1,477
Total gains or (losses) (realized/unrealized) Included in Net Income 38 45 129
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 5 36
Sales 0 0 (392)
Issues 0 0 0
Settlements (216) (233) (255)
Transfers out of Level 3 (162) (70) (77)
Transfers into Level 3 161 172 279
Ending Balance 937 1,116 1,197
Net derivatives [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 40 13 (132)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 134 44 157
Total gains or (losses) (realized/unrealized) Included in Net Income (38) 111 15
Total gains or (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 (8)
Settlements 45 (22) (122)
Transfers out of Level 3 53 6 2
Transfers into Level 3 0 (5) 0
Ending Balance 194 134 44
Long-term debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net unrealized Gains (Losses) included in net income related to liabilities still held 23 (40) 13
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (958) (588) (865)
Total gains (losses) (realized/unrealized) Included in Net Income 34 38 (53)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (1) (2) (74)
Settlements 44 66 378
Transfers out of Level 3 541 388 215
Transfers Into Level 3 (214) (784) (189)
Ending Balance (552) (958) (588)
Long-term debt [Member] | Consolidated Trusts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net unrealized Gains (Losses) included in net income related to liabilities still held (2) (11) (9)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (582) (241) (496)
Total gains (losses) (realized/unrealized) Included in Net Income (9) 9 (75)
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (1) (2) (74)
Settlements 44 66 378
Transfers out of Level 3 541 388 215
Transfers Into Level 3 (214) (784) (189)
Ending Balance (201) (582) (241)
Long-term debt [Member] | Senior floating [Member] | Fannie Mae [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net unrealized Gains (Losses) included in net income related to liabilities still held 25 (29) 22
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (376) (347) (369)
Total gains (losses) (realized/unrealized) Included in Net Income (25) (29) 22
Total gains (losses) Included in Other Comprehensive Income 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements 0 0 0
Transfers out of Level 3 0 0 0
Transfers Into Level 3 0 0 0
Ending Balance (351) (376) (347)
Other Comprehensive Income (Loss) [Member] | Trading Assets, Excluding Debt and Equity Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Other Comprehensive Income (Loss) [Member] | Trading Assets, Excluding Debt and Equity Securities [Member] | Fannie Mae [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Other Comprehensive Income (Loss) [Member] | Trading Assets, Excluding Debt and Equity Securities [Member] | Other agency [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Other Comprehensive Income (Loss) [Member] | Trading Assets, Excluding Debt and Equity Securities [Member] | Alt-A and subprime private-label securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 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]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 1 (5)
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]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Other Comprehensive Income (Loss) [Member] | Available-for-sale securities [Member] | Other agency [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held   0 0
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]      
Net Unrealized Gains (Losses) included in net income related to assets still held 1 4 (5)
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]      
Net Unrealized Gains (Losses) included in net income related to assets still held (2) 4 (1)
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]      
Net Unrealized Gains (Losses) included in net income related to assets still held 1 (7) 1
Other Comprehensive Income (Loss) [Member] | Mortgage loans [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Other Comprehensive Income (Loss) [Member] | Net derivatives [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Unrealized Gains (Losses) included in net income related to assets still held 0 0 0
Other Comprehensive Income (Loss) [Member] | Long-term debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net unrealized Gains (Losses) included in net income related to liabilities still held 0 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]      
Net unrealized Gains (Losses) included in net income related to liabilities still held 0 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]      
Net unrealized Gains (Losses) included in net income related to liabilities still held $ 0 $ 0 $ 0