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Investments - Investments - Mortgage Servicing (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding | $ 10,000 | $ 9,400
Loans serviced on behalf of third parties | 4,800 | 4,400
Servicing rights | 0 | 0
Investments [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Loans serviced on behalf of third parties, retained and reported as assets | $ 5,200 | $ 5,000

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