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Fair Value - Recurring Level 3 Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement Of Income, Extensible List Not Disclosed Flag Total long-term debt Total long-term debt Total long-term debt
Fair Value, Recurring Basis, Unobservable Input, Reconciliation, Asset Gain (Loss), Statement Of Income, Extensible List, Not Disclosed Flag Included in Net Income Included in Net Income Included in Net Income
Fair Value, Recurring Basis, Unobservable Input, Reconciliation, Liability Gain (Loss), Statement Of Income, Extensible List, Not Disclosed Flag Included in Net Income Included in Net Income Included in Net Income
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement Of Income, Extensible List Not Disclosed Flag Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of December 31, 2023(4)(5) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of December 31, 2022(4)(5) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of December 31, 2021(4)(5)
Trading securities: | Mortgage-related      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance $ 47 $ 57 $ 95
Total gains or (losses) (realized/unrealized), net income (9) (8) (24)
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 18
Sales 0 0 0
Issues 0 0 0
Settlements (1) (1) 0
Transfers out of Level 3 (20) (54) (165)
Transfers into Level 3 9 53 133
Ending Balance 26 47 57
Net unrealized gains (losses) included in net income related to assets still held (6) (6) 0
Available-for-sale securities:      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 634 753 648
Total gains or (losses) (realized/unrealized), net income 7 (8) 14
Total gains or (losses) (realized/unrealized), OCI (3) (20) (7)
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements (124) (90) (171)
Transfers out of Level 3 (118) (2) (107)
Transfers into Level 3 118 1 376
Ending Balance 514 634 753
Net unrealized gains (losses) included in net income related to assets still held (1) (16) 1
Available-for-sale securities: | Agency securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 371 431 195
Total gains or (losses) (realized/unrealized), net income 0 2 1
Total gains or (losses) (realized/unrealized), OCI (10) (18) (1)
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements (29) (44) (33)
Transfers out of Level 3 (117) 0 (107)
Transfers into Level 3 116 0 376
Ending Balance 331 371 431
Net unrealized gains (losses) included in net income related to assets still held (6) (14) 2
Available-for-sale securities: | Other      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 263 322 453
Total gains or (losses) (realized/unrealized), net income 7 (10) 13
Total gains or (losses) (realized/unrealized), OCI 7 (2) (6)
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements (95) (46) (138)
Transfers out of Level 3 (1) (2) 0
Transfers into Level 3 2 1 0
Ending Balance 183 263 322
Net unrealized gains (losses) included in net income related to assets still held 5 (2) (1)
Mortgage loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 543 755 861
Total gains or (losses) (realized/unrealized), net income 12 (67) 31
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 89
Sales (1) (4) (66)
Issues 0 0 0
Settlements (79) (135) (194)
Transfers out of Level 3 (63) (82) (86)
Transfers into Level 3 65 76 120
Ending Balance 477 543 755
Net unrealized gains (losses) included in net income related to assets still held 6 (57) 26
Net derivatives      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (37) 131 333
Total gains or (losses) (realized/unrealized), net income 78 (204) (209)
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements 36 36 7
Transfers out of Level 3 0 0 0
Transfers into Level 3 0 0 0
Ending Balance 77 (37) 131
Net unrealized gains (losses) included in net income related to assets still held 114 (168) (202)
Long-term debt:      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (378) (468) (499)
Total gains (losses) (realized/unrealized), net income (25) 137 42
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 (86) 0
Settlements 17 39 16
Transfers out of Level 3 53 2 20
Transfers into Level 3 (52) (2) (47)
Ending Balance (385) (378) (468)
Net unrealized gains (losses) included in net income related to liabilities still held (25) 137 41
Long-term debt: | Fannie Mae      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (242) (373) (416)
Total gains (losses) (realized/unrealized), net income (26) 131 43
Total gains or (losses) (realized/unrealized), OCI 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 (268) (242) (373)
Net unrealized gains (losses) included in net income related to liabilities still held (26) 131 43
Long-term debt: | Consolidated Trusts      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (136) (95) (83)
Total gains (losses) (realized/unrealized), net income 1 6 (1)
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 (86) 0
Settlements 17 39 16
Transfers out of Level 3 53 2 20
Transfers into Level 3 (52) (2) (47)
Ending Balance (117) (136) (95)
Net unrealized gains (losses) included in net income related to liabilities still held $ 1 $ 6 $ (2)