Policyholder Account Balances - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Dec. 31, 2024
FABN
Policyholder Account Balance [Line Items]
Funding agreement, amount			$ 5,000
Funding agreement, amount issued	$ 2,400	$ 1,500
Funding Agreement-Backed Repurchase
Policyholder Account Balance [Line Items]
Funding agreement, amount	$ 800	800
Funding agreement, term	5 years
Federal Home Loan Bank
Policyholder Account Balance [Line Items]
Funding agreement, amount issued	$ 1,600	$ 1,500
Funding agreement, term	1 year
Minimum | FABN
Policyholder Account Balance [Line Items]
Funding agreement, term	3 years
Maximum | FABN
Policyholder Account Balance [Line Items]
Funding agreement, term	5 years