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Fair Value - Recurring Level 3 Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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, 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, 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) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of December 31, 2020(4)(5)
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, 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
Trading securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance $ 57    
Total gains or (losses) (realized/unrealized), net income (8)    
Total gains or (losses) (realized/unrealized), OCI 0    
Purchases 0    
Sales 0    
Issues 0    
Settlements (1)    
Transfers out of Level 3 (54)    
Transfers into Level 3 53    
Ending Balance 47 $ 57  
Net unrealized gains (losses) included in net income related to assets still held (6)    
Trading securities | Mortgage-related securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 57 95 $ 46
Total gains or (losses) (realized/unrealized), net income   (24) (9)
Total gains or (losses) (realized/unrealized), OCI   0 0
Purchases   18 0
Sales   0 (95)
Issues   0 0
Settlements   0 (3)
Transfers out of Level 3   (165) (49)
Transfers into Level 3   133 205
Ending Balance   57 95
Net unrealized gains (losses) included in net income related to assets still held   0 (8)
Debt securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 753 648 792
Total gains or (losses) (realized/unrealized), net income (8) 14 (8)
Total gains or (losses) (realized/unrealized), OCI (20) (7) 5
Purchases 0 0 0
Sales 0 0 (1)
Issues 0 0 0
Settlements (90) (171) (177)
Transfers out of Level 3 (2) (107) (243)
Transfers into Level 3 1 376 280
Ending Balance 634 753 648
Net unrealized gains (losses) included in net income related to assets still held (16) 1 4
Debt securities | Agency securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 431 195 171
Total gains or (losses) (realized/unrealized), net income 2 1 1
Total gains or (losses) (realized/unrealized), OCI (18) (1) 4
Purchases 0 0 0
Sales 0 0 (1)
Issues 0 0 0
Settlements (44) (33) (15)
Transfers out of Level 3 0 (107) (243)
Transfers into Level 3 0 376 278
Ending Balance 371 431 195
Net unrealized gains (losses) included in net income related to assets still held (14) 2 0
Debt securities | Other      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 322 453 621
Total gains or (losses) (realized/unrealized), net income (10) 13 (9)
Total gains or (losses) (realized/unrealized), OCI (2) (6) 1
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements (46) (138) (162)
Transfers out of Level 3 (2) 0 0
Transfers into Level 3 1 0 2
Ending Balance 263 322 453
Net unrealized gains (losses) included in net income related to assets still held (2) (1) 4
Mortgage loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 755 861 688
Total gains or (losses) (realized/unrealized), net income (67) 31 47
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 89 0
Sales (4) (66) (21)
Issues 0 0 0
Settlements (135) (194) (132)
Transfers out of Level 3 (82) (86) (104)
Transfers into Level 3 76 120 383
Ending Balance 543 755 861
Net unrealized gains (losses) included in net income related to assets still held (57) 26 11
Net derivatives      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 131 333 162
Total gains or (losses) (realized/unrealized), net income (204) (209) 233
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues 0 0 0
Settlements 36 7 (80)
Transfers out of Level 3 0 0 18
Transfers into Level 3 0 0 0
Ending Balance (37) 131 333
Net unrealized gains (losses) included in net income related to assets still held (168) (202) 159
Long-term debt      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (468) (499) (473)
Total gains (losses) (realized/unrealized), net income 137 42 (43)
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (86) 0 0
Settlements 39 16 41
Transfers out of Level 3 2 20 5
Transfers Into Level 3 (2) (47) (29)
Ending Balance (378) (468) (499)
Net unrealized gains (losses) included in net income related to liabilities still held 137 41 (42)
Long-term debt | Fannie Mae      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (373) (416) (398)
Total gains (losses) (realized/unrealized), net income 131 43 (41)
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 23
Transfers out of Level 3 0 0 0
Transfers Into Level 3 0 0 0
Ending Balance (242) (373) (416)
Net unrealized gains (losses) included in net income related to liabilities still held 131 43 (41)
Long-term debt | Consolidated Trusts      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (95) (83) (75)
Total gains (losses) (realized/unrealized), net income 6 (1) (2)
Total gains or (losses) (realized/unrealized), OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (86) 0 0
Settlements 39 16 18
Transfers out of Level 3 2 20 5
Transfers Into Level 3 (2) (47) (29)
Ending Balance (136) (95) (83)
Net unrealized gains (losses) included in net income related to liabilities still held $ 6 $ (2) $ (1)