v3.26.1
Held-to-maturity Securities (Redemption Terms) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Estimated fair value of held-to-maturity securites $ 22,160 $ 24,509
Held-to-Maturity, Amortized Cost [1] 22,307 24,658
Held-to-Maturity, Accrued Interest Receivable   43
Non-mortgage backed securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost of held -to-maturity securities due in one year or less [1] 200 101
Amortized cost of held-to-maturity securities due after one year through five years [1] 105 200
Amortized Cost of held-to-maturity securities due after five years through ten years [1] 61 60
Estimated fair value of held-to-maturity securities due in one year or less 200 101
Estimated fair value of held-to-maturity securities due after one year through five years 106 201
Estimated fair value of Held-to-maturity securities due after five years through ten years 62 61
Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value 368 363
Held-to-Maturity, Amortized Cost [1] 366 361
Mortgage-backed securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-Maturity Mortgage-backed securities, Fair Value [2] 21,792 24,146
Held-to-Maturity, Amortized Cost [1],[2] $ 21,941 $ 24,297
[1] Excludes accrued interest receivable of $36 and $43 as of June 30, 2026 and December 31, 2025, respectively
[2] Mortgage-backed securities (MBS) are not presented by contractual maturity because their actual maturities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment fees.