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Fair Value - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
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, 2024(4)(5) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of March 31, 2023(4)(5)
Total available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 514 $ 634
Total gains (losses) (realized/unrealized) included in net income 1 2
Total gains (losses) (realized/unrealized) Included in OCI (loss) 9 3
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (37) (18)
Transfers out of Level 3 0 0
Transfers into Level 3 0 1
Ending Balance 487 622
Net unrealized gain (losses) related to assets 7 2
Mortgage loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 477 543
Total gains (losses) (realized/unrealized) included in net income 1 7
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0
Purchases 0 0
Sales (4) 0
Issues 0 0
Settlements (17) (25)
Transfers out of Level 3 (9) (9)
Transfers into Level 3 22 10
Ending Balance 470 526
Net unrealized gain (losses) related to assets 1 6
Net derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 77 (37)
Total gains (losses) (realized/unrealized) included in net income (12) (6)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 4 5
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 69 (38)
Net unrealized gain (losses) related to assets (8) (1)
Long-term debt:    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (385) (378)
Total gains (losses) (realized/unrealized) included in net income (6) (10)
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 4 5
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance (387) (383)
Net unrealized gain (losses) related to liabilities (6) (10)
Fannie Mae | Long-term debt:    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (268) (242)
Total gains (losses) (realized/unrealized) included in net income (5) (8)
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 (273) (250)
Net unrealized gain (losses) related to liabilities (5) (8)
Consolidated Trusts | Long-term debt:    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance (117) (136)
Total gains (losses) (realized/unrealized) included in net income (1) (2)
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements 4 5
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance (114) (133)
Net unrealized gain (losses) related to liabilities (1) (2)
Mortgage-related | Total trading securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 26 47
Total gains (losses) (realized/unrealized) included in net income (1) (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 0 (9)
Transfers into Level 3 3 0
Ending Balance 28 32
Net unrealized gain (losses) related to assets (1) (4)
Agency securities | Total available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 331 371
Total gains (losses) (realized/unrealized) included in net income 0 0
Total gains (losses) (realized/unrealized) Included in OCI (loss) 1 (1)
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (9) (8)
Transfers out of Level 3 0 0
Transfers into Level 3 0 0
Ending Balance 323 362
Net unrealized gain (losses) related to assets 0 (1)
Other mortgage-related | Total available-for-sale securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 183 263
Total gains (losses) (realized/unrealized) included in net income 1 2
Total gains (losses) (realized/unrealized) Included in OCI (loss) 8 4
Purchases 0 0
Sales 0 0
Issues 0 0
Settlements (28) (10)
Transfers out of Level 3 0 0
Transfers into Level 3 0 1
Ending Balance 164 260
Net unrealized gain (losses) related to assets $ 7 $ 3