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Derivative Instruments - FV Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net $ (66) $ 312 $ (401) $ 984  
Net contractual interest income (expense) on interest-rate swaps 7,155 7,268 14,156 14,291  
Interest income on mortgage loans 37,693 35,617 75,092 70,833  
Long-term debt (32,153) (29,877) (64,063) (59,457)  
Hedged asset, carrying amount 1,077,730   1,077,730   $ 1,109,445
Hedged asset, total basis adjustments (146)   (146)   (816)
Hedged asset, discontinued fair value, remaining adjustments (146)   (146)   (816)
Closed portfolio, amortized cost 197,939   197,939   813,536
Closed portfolio, designated UPB 30,486   30,486   26,825
Hedged liability, carrying amount (37,434)   (37,434)   (47,849)
Hedged liability, total basis adjustments 2,676   2,676   3,390
Hedged liability, discontinued fair value, remaining adjustments 2,676   2,676   $ 3,390
Pay-fixed          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net (331) 237 (1,210) 1,599  
Receive-fixed          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net 602 209 1,617 (487)  
Basis          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net (11) (4) 1 (3)  
Foreign currency          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net 23 (3) 32 (11)  
Pay-fixed          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net (1) 21 (15) 44  
Receive-fixed          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net (9) 7 (9) 3  
Futures          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net 2 1 1 2  
Risk Management Derivatives          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net 92 217 16 697  
Net contractual interest income (expense) on interest-rate swaps (183) (251) (401) (450)  
Mortgage commitment derivatives fair value gains (losses), net          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net (147) 94 (389) 301  
Credit enhancement derivatives fair value gains (losses), net          
Derivative Instruments, Gain (Loss) [Line Items]          
Total derivatives fair value gains (losses), net (11) 1 (28) (14)  
Interest rate risk on held-for-investment mortgage loan | Interest Income          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) in hedged item 211 (28) 647 (362)  
Discontinued hedge related basis adjustment amortization 7 18 23 26  
Change in unrealized gain (loss) in derivatives designated as hedging instruments (202) 6 (643) 315  
Interest accruals on hedging instruments 53 76 109 142  
Total effect of fair value hedges 69 72 136 121  
Interest rate risk on debt | Interest Expense          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) in hedged item (62) 129 (274) 557  
Discontinued hedge related basis adjustment amortization (214) (222) (440) (428)  
Change in unrealized gain (loss) in derivatives designated as hedging instruments 62 (78) 278 (433)  
Interest accruals on hedging instruments (22) (113) (45) (280)  
Total effect of fair value hedges $ (236) $ (284) $ (481) $ (584)