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Investments (Securities Lending) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Securities Financing Transaction [Line Items]    
Cash collateral received from counterparties $ 3,271 $ 3,210
Reinvestment portfolio — estimated fair value 3,360 3,217
Amortized cost    
Securities Financing Transaction [Line Items]    
Securities on loan 3,601 3,582
Estimated fair value    
Securities Financing Transaction [Line Items]    
Securities on loan $ 3,185 $ 3,127