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Fair Value Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Trading securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets $ 2 $ 3 $ 3 $ 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 67 84 33 1,201
Total gains (losses) (realized/unrealized) Included in Net Income 1 (5) 3 80
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 1
Sales (14) 0 (14) (1,060)
Issues 0 0 0 0
Settlements (16) 0 (17) (6)
Transfers out of Level 3 0 0 0 (137)
Transfers into Level 3 36 1 69 1
Ending Balance 74 80 74 80
Trading securities [Member] | Fannie Mae [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 2 3 3 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 67 83 32 971
Total gains (losses) (realized/unrealized) Included in Net Income 1 (5) 3 166
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 1
Sales (14) 0 (14) (1,060)
Issues 0 0 0 0
Settlements (16) 0 (16) 0
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 36 1 69 1
Ending Balance 74 79 74 79
Trading securities [Member] | Other agency [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets       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   0   (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   0
Trading securities [Member] | Private-label and other mortgage securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets   0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   1 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 0
Purchases   0 0 0
Sales   0 0 0
Issues   0 0 0
Settlements   0 (1) (5)
Transfers out of Level 3   0 0 (104)
Transfers into Level 3   0 0 0
Ending Balance 0 1 0 1
Available-for-sale Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 984 1,119 952 1,313
Total gains (losses) (realized/unrealized) Included in Net Income 10 (3) 17 15
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (9) 24 (10) (40)
Purchases 0 0 0 0
Sales (27) (7) (27) (18)
Issues 0 0 0 0
Settlements (72) (40) (90) (173)
Transfers out of Level 3 (64) 0 (105) (4)
Transfers into Level 3 0 0 85 0
Ending Balance 822 1,093 822 1,093
Available-for-sale Securities [Member] | Fannie Mae [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 199 202 152 208
Total gains (losses) (realized/unrealized) Included in Net Income 0 1 0 1
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 2 4 6 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (7) (3) (7) (5)
Transfers out of Level 3 (62) 0 (103) 0
Transfers into Level 3 0 0 84 0
Ending Balance 132 204 132 204
Available-for-sale Securities [Member] | Private-label and other mortgage securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 23 27 24 77
Total gains (losses) (realized/unrealized) Included in Net Income 5 0 5 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (5) 0 (5) (45)
Purchases 0 0 0 0
Sales (23) 0 (23) 0
Issues 0 0 0 0
Settlements 0 (1) (1) (2)
Transfers out of Level 3 0 0 0 (4)
Transfers into Level 3 0 0 0 0
Ending Balance 0 26 0 26
Available-for-sale Securities [Member] | Mortgage revenue bonds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 425 539 434 671
Total gains (losses) (realized/unrealized) Included in Net Income 0 (11) 0 0
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (1) 10 (1) (3)
Purchases 0 0 0 0
Sales (4) (7) (4) (18)
Issues 0 0 0 0
Settlements (56) (25) (65) (144)
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 0 0 0 0
Ending Balance 364 506 364 506
Available-for-sale Securities [Member] | Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 0 0 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 337 351 342 357
Total gains (losses) (realized/unrealized) Included in Net Income 5 7 12 14
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) (5) 10 (10) 8
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (9) (11) (17) (22)
Transfers out of Level 3 (2) 0 (2) 0
Transfers into Level 3 0 0 1 0
Ending Balance 326 357 326 357
Mortgage loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 14 8 22 16
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 934 1,102 937 1,116
Total gains (losses) (realized/unrealized) Included in Net Income 17 11 31 28
Total gains (losses) (realized/unrealized) Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales (13) 0 (13) 0
Issues 0 0 0 0
Settlements (36) (79) (70) (127)
Transfers out of Level 3 (159) (51) (187) (87)
Transfers into Level 3 27 35 72 88
Ending Balance 770 1,018 770 1,018
Net derivatives [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 18 (14) 24 (37)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 203 133 194 134
Total gains (losses) (realized/unrealized) Included in Net Income 20 (28) 118 (86)
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 (31) (12) (120) 16
Transfers out of Level 3 (9) 0 (9) 53
Transfers into Level 3 0 0 0 0
Ending Balance 183 117 183 117
Long-term debt [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Liabilities (23) 2 (49) 21
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (600) (819) (552) (958)
Total gains (losses) (realized/unrealized) Included in Net Income (23) (7) (51) (29)
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances 0 0 0 (1)
Settlements 5 21 10 31
Transfers out of Level 3 120 177 169 331
Transfers into Level 3 (2) (59) (76) (107)
Ending Balance (500) (673) (500) (673)
Long-term debt [Member] | Consolidated Trusts [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Liabilities (1) (1) (2) (1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (224) (462) (201) (582)
Total gains (losses) (realized/unrealized) Included in Net Income 1 (4) 4 (7)
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances 0 0 0 (1)
Settlements 5 21 10 31
Transfers out of Level 3 120 177 169 331
Transfers into Level 3 (2) (59) (76) (107)
Ending Balance (102) (319) (102) (319)
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 Gain (Losses) Related to Liabilities (22) 3 (47) 22
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (376) (357) (351) (376)
Total gains (losses) (realized/unrealized) Included in Net Income 22 3 47 22
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances 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 (398) (354) (398) (354)
Other Comprehensive Income (Loss) [Member] | Trading securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 0 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]        
Net Unrealized Gain (Losses) Related to Assets 0 0 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]        
Net Unrealized Gain (Losses) Related to Assets       0
Other Comprehensive Income (Loss) [Member] | Trading securities [Member] | Private-label and other mortgage securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets   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 Gain (Losses) Related to Assets 0 19 (3) 9
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 Gain (Losses) Related to Assets 3 3 5 0
Other Comprehensive Income (Loss) [Member] | Available-for-sale Securities [Member] | Private-label and other mortgage securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 0 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]        
Net Unrealized Gain (Losses) Related to Assets 0 8 (1) 0
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 Gain (Losses) Related to Assets (3) 8 (7) 8
Other Comprehensive Income (Loss) [Member] | Mortgage loans [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net Unrealized Gain (Losses) Related to Assets 0 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 Gain (Losses) Related to Assets 0 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 Gain (Losses) Related to Liabilities 0 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 Gain (Losses) Related to Liabilities 0 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 Gain (Losses) Related to Liabilities $ 0 $ 0 $ 0 $ 0