v3.26.1
Derivatives and Hedging Activities (Derivatives in Statement of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 44 $ (24) $ 90 $ (59)  
Interest Income, Federal Home Loan Bank Advances, Including Prepayment Fees 1,406 1,286 2,699 2,473  
Consolidated obligations - Discount notes (930) (595) (1,818) (1,291)  
Available-for-sale securities 310 345 632 684  
Consolidated obligations - Bonds (941) (1,244) (1,855) (2,301)  
Consolidated Obligation Bonds [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Liability, Fair Value Hedge 26,706   26,706   $ 20,546
Hedged Liability, Active Fair Value Hedge, Cumulative Increase (Decrease) (70)   (70)   56
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0   0   0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (70)   (70)   56
Consolidated Obligation Discount Notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Liability, Fair Value Hedge 89,990   89,990   61,439
Hedged Liability, Active Fair Value Hedge, Cumulative Increase (Decrease) (26)   (26)   17
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0   0   0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (26)   (26)   17
Advances [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Asset, Fair Value Hedge 62,503   62,503   58,516
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) (497)   (497)   82
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (4)   (4)   (10)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) (501)   (501)   72
Available-for-sale Securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Asset, Fair Value Hedge 20,102   20,102   19,983
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) (617)   (617)   (315)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (40)   (40)   (42)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) (657)   (657)   $ (357)
Gain (Loss) on Derivative Instruments [Member] | Interest Rate Swap [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 43 (23) 86 (76)  
Gain (Loss) on Derivative Instruments [Member] | Forward Contracts [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0 0 3 (2)  
Gain (Loss) on Derivative Instruments [Member] | Net Interest Settlements [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 1 (1) 4 17  
Interest Expense [Member] | Interest Rate Contract [Member] | Consolidated Obligation Discount Notes [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (Losses) on Derivatives (15) 0 (30) 0  
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 17 0 42 0  
Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income 2 0 12 0  
Interest Expense [Member] | Interest Rate Contract [Member] | Consolidated Obligation Bonds [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (Losses) on Derivatives (33) 15 (100) 64  
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 49 (23) 126 (77)  
Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income 16 (8) 26 (13)  
Interest Income [Member] | Interest Rate Contract [Member] | Advances [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (Losses) on Derivatives 372 (157) 649 (498)  
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (335) 282 (573) 743  
Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income 37 125 76 245  
Interest Income [Member] | Interest Rate Contract [Member] | Available-for-sale Securities [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gains (Losses) on Derivatives 222 (183) 341 (517)  
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (209) 233 (299) 617  
Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income 13 50 42 100  
Mortgage Receivable [Member] | Gain (Loss) on Derivative Instruments [Member] | Forward Contracts [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 0 $ 0 $ (3) $ 2