v3.26.1
Investments (Securities Lending and Repurchase Agreements) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Securities Financing Transaction [Line Items]    
Cash collateral on deposit from counterparties $ 12,552 $ 12,198
Reinvestment portfolio - estimated fair value 12,481 12,082
Estimated fair value    
Securities Financing Transaction [Line Items]    
Securities loaned 12,169 11,866
Securities Sold under Agreements to Repurchase 3,124 3,002
Repurchase Agreements    
Securities Financing Transaction [Line Items]    
Cash collateral on deposit from counterparties 3,075 2,975
Reinvestment portfolio - estimated fair value $ 3,043 $ 2,948