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Investments - Investments - Mortgage Servicing (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding $ 10,100 $ 10,000
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding 4,800 4,800
Servicing Asset at Fair Value, Amount 0 0
Investments [Member]    
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding $ 5,300 $ 5,200