v3.26.3
Derivatives and Hedging Activities (Derivatives in Statement of Income and Impact on Interest) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain/(loss) on derivatives $ 15 $ 15 $ 46 $ 1
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 17 3    
Net interest settlements        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (2) 12    
Total net gain/(loss) related to derivatives not designated as hedging instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 15 15 46 2
Price Alignment Amount        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0 0 0 (1)
Interest Rate Contract | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Percentage of Total Advances Outstanding        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 78 11 174 (73)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (73) 22 (153) 175
Net Gains Losses On Qualifying Active Fair Value Hedging Relationships 5 33 21 102
Interest Rate Contract | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Available-for-sale Securities        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 490 7 792 (325)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (471) 52 (733) 499
Net Gains Losses On Qualifying Active Fair Value Hedging Relationships 19 59 59 174
Interest Rate Contract | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Consolidated Obligations, Bonds        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments (97) 1 (158) 56
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 84 (62) 103 (232)
Net Gains Losses On Qualifying Active Fair Value Hedging Relationships (13) (61) (55) (176)
Interest Rate Contract | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Discount notes        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 1 (1) (2) (5)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 0 (2) 5 2
Net Gains Losses On Qualifying Active Fair Value Hedging Relationships $ 1 $ (3) 3 (3)
Not Designated as Hedging Instrument, Economic Hedge | Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net     43 (34)
Not Designated as Hedging Instrument, Economic Hedge | Net interest settlements        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net     $ 3 $ 36