v3.26.3
Derivatives and Hedging Activities (Derivatives in Statement of Income) (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]        
Advances $ 357 $ 462 $ 1,108 $ 1,468
AFS securities 231 280 694 818
Bonds (341) (561) (1,069) (1,761)
Discount notes (225) (173) (661) (499)
Advances | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Interest Rate Contract        
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
Available-for-sale Securities | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Interest Rate Contract        
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
Consolidated Obligations, Bonds | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Interest Rate Contract        
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)
Discount notes | Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | Interest Rate Contract        
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)