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Fair Value - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
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
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
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
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 March 31, 2023(4)(5) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of March 31, 2022(4)(5)
Total available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 634 $ 753
Total gains (losses) (realized/unrealized) included in net income 2 (7)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 3 (5)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (18) (13)
Transfers out of Level 3 0 (2)
Transfers into Level 3 1 1
Ending Balance 622 727
Net unrealized gain (losses) related to assets 2 (4)
Mortgage loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 543 755
Total gains (losses) (realized/unrealized) included in net income 7 (25)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (25) (41)
Transfers out of Level 3 (9) (44)
Transfers into Level 3 10 23
Ending Balance 526 668
Net unrealized gain (losses) related to assets 6 (21)
Net derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (37) 131
Total gains (losses) (realized/unrealized) included in net income (6) (82)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 5 8
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance (38) 57
Net unrealized gain (losses) related to assets (1) (74)
Long-term debt:    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (378) (468)
Total gains (losses) (realized/unrealized) included in net income (10) 68
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 (86)
Settlements 5 18
Transfers out of Level 3 0 1
Transfers into Level 3 0 (1)
Ending Balance (383) (468)
Net unrealized gain (losses) related to liabilities (10) 68
Fannie Mae | Long-term debt:    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (242) (373)
Total gains (losses) (realized/unrealized) included in net income (8) 66
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 0 0
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance (250) (307)
Net unrealized gain (losses) related to liabilities (8) 66
Consolidated Trusts | Long-term debt:    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (136) (95)
Total gains (losses) (realized/unrealized) included in net income (2) 2
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 (86)
Settlements 5 18
Transfers out of Level 3 0 1
Transfers into Level 3 0 (1)
Ending Balance (133) (161)
Net unrealized gain (losses) related to liabilities (2) 2
Mortgage-related | Total trading securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 47 57
Total gains (losses) (realized/unrealized) included in net income (6) (6)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 0 0
Transfers out of Level 3 (9) (9)
Transfers into Level 3 0 5
Ending Balance 32 47
Net unrealized gain (losses) related to assets (4) (4)
Agency securities | Total available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 371 431
Total gains (losses) (realized/unrealized) included in net income 0 1
Total gains (losses) (realized/unrealized) Included in OCI (loss) (1) (4)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (8) (10)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 362 418
Net unrealized gain (losses) related to assets (1) (3)
Other mortgage-related | Total available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 263 322
Total gains (losses) (realized/unrealized) included in net income 2 (8)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 4 (1)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (10) (3)
Transfers out of Level 3 0 (2)
Transfers into Level 3 1 1
Ending Balance 260 309
Net unrealized gain (losses) related to assets $ 3 $ (1)