v3.26.1
Derivative instruments - Protection Sold Credit Derivatives (Details) - EBP 002 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Derivative [Line Items]    
Credit derivatives, maturity, less than one year $ 1,400,000 $ 800,000
Credit derivatives, maturity, 1-5 years 75,100,000 91,500,000
Credit derivatives, maturity, more than five years 400,000 400,000
Credit derivatives, total notional amount 76,900,000 92,700,000
Credit derivatives, fair value of receivables 122,416 4,983
Credit derivatives, fair value of payables (2,308) (9,839)
Credit derivatives, net fair value 120,108 (4,856)
Investment-grade    
EBP, Derivative [Line Items]    
Credit derivatives, maturity, less than one year 1,400,000 800,000
Credit derivatives, maturity, 1-5 years 69,900,000 89,200,000
Credit derivatives, maturity, more than five years 400,000 400,000
Credit derivatives, total notional amount 71,700,000 90,400,000
Credit derivatives, fair value of receivables 122,416 4,983
Credit derivatives, fair value of payables 0 (9,839)
Credit derivatives, net fair value 122,416 (4,856)
Noninvestment-grade    
EBP, Derivative [Line Items]    
Credit derivatives, maturity, less than one year 0 0
Credit derivatives, maturity, 1-5 years 5,200,000 2,300,000
Credit derivatives, maturity, more than five years 0 0
Credit derivatives, total notional amount 5,200,000 2,300,000
Credit derivatives, fair value of receivables 0 0
Credit derivatives, fair value of payables (2,308) 0
Credit derivatives, net fair value $ (2,308) $ 0