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Fair Value - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 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 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 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 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 September 30, 2023(4)(5) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of September 30, 2022(4)(5) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of September 30, 2023(4)(5) Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held as of September 30, 2022(4)(5)
Total available-for-sale securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 591 $ 693 $ 634 $ 753
Total gains (losses) (realized/unrealized) included in net income 1 (1) 7 (8)
Total gains (losses) (realized/unrealized) Included in OCI (loss) (19) 0 (13) (6)
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (42) (18) (97) (64)
Transfers out of Level 3 (117) 0 (118) (2)
Transfers into Level 3 1 0 2 1
Ending Balance 415 674 415 674
Net unrealized gain (losses) related to assets (12) 1 (6) (4)
Mortgage loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 510 599 543 755
Total gains (losses) (realized/unrealized) included in net income (2) (20) 1 (68)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 (2)
Issues 0 0 0 0
Settlements (19) (33) (64) (115)
Transfers out of Level 3 (15) (13) (30) (73)
Transfers into Level 3 17 12 41 48
Ending Balance 491 545 491 545
Net unrealized gain (losses) related to assets (4) (21) (4) (59)
Net derivatives        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 12 (7) (37) 131
Total gains (losses) (realized/unrealized) included in net income 28 (26) 60 (183)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (1) 1 16 20
Transfers out of Level 3 0 0 0 0
Transfers into Level 3 0 0 0 0
Ending Balance 39 (32) 39 (32)
Net unrealized gain (losses) related to assets 26 (25) 76 (163)
Long-term debt:        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (381) (405) (378) (468)
Total gains (losses) (realized/unrealized) included in net income 17 3 3 125
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 (86)
Settlements 4 7 15 34
Transfers out of Level 3 52 0 52 1
Transfers into Level 3 (1) 0 (1) (1)
Ending Balance (309) (395) (309) (395)
Net unrealized gain (losses) related to liabilities 16 2 3 125
Fannie Mae | Long-term debt:        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (256) (253) (242) (373)
Total gains (losses) (realized/unrealized) included in net income 16 (1) 2 119
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 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 (240) (254) (240) (254)
Net unrealized gain (losses) related to liabilities 16 (1) 2 119
Consolidated Trusts | Long-term debt:        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance (125) (152) (136) (95)
Total gains (losses) (realized/unrealized) included in net income 1 4 1 6
Total gains (losses) (realized/unrealized) included in OCI (loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 (86)
Settlements 4 7 15 34
Transfers out of Level 3 52 0 52 1
Transfers into Level 3 (1) 0 (1) (1)
Ending Balance (69) (141) (69) (141)
Net unrealized gain (losses) related to liabilities 0 3 1 6
Mortgage-related | Total trading securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 28 76 47 57
Total gains (losses) (realized/unrealized) included in net income (4) (3) (12) (11)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements 0 0 0 (1)
Transfers out of Level 3 (4) (33) (15) (47)
Transfers into Level 3 4 0 4 42
Ending Balance 24 40 24 40
Net unrealized gain (losses) related to assets (4) 2 (9) (2)
Agency securities | Total available-for-sale securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 356 404 371 431
Total gains (losses) (realized/unrealized) included in net income 0 1 1 2
Total gains (losses) (realized/unrealized) Included in OCI (loss) (19) (1) (18) (5)
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (8) (11) (25) (35)
Transfers out of Level 3 (117) 0 (117) 0
Transfers into Level 3 0 0 0 0
Ending Balance 212 393 212 393
Net unrealized gain (losses) related to assets (12) (1) (10) (4)
Other mortgage-related | Total available-for-sale securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 235 289 263 322
Total gains (losses) (realized/unrealized) included in net income 1 (2) 6 (10)
Total gains (losses) (realized/unrealized) Included in OCI (loss) 0 1 5 (1)
Purchases 0 0 0 0
Sales 0 0 0 0
Issues 0 0 0 0
Settlements (34) (7) (72) (29)
Transfers out of Level 3 0 0 (1) (2)
Transfers into Level 3 1 0 2 1
Ending Balance 203 281 203 281
Net unrealized gain (losses) related to assets $ 0 $ 2 $ 4 $ 0