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Investments (Securities Lending and Repurchase Agreements) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Securities Financing Transaction [Line Items]
Cash collateral on deposit from counterparties	$ 12,230	$ 11,404
Reinvestment portfolio - estimated fair value	12,160	11,202
Estimated fair value
Securities Financing Transaction [Line Items]
Securities loaned	11,925	11,119
Securities Sold under Agreements to Repurchase	3,006	3,019
Repurchase Agreements
Securities Financing Transaction [Line Items]
Cash collateral on deposit from counterparties	2,975	2,975
Reinvestment portfolio - estimated fair value	$ 2,952	$ 2,925

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Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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