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Investments (Equity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Unrealized Gains (Losses)	$ 3,191	$ 2,388
Equity securities	788	712
Common Stock
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	405	451
Equity Securities, FV-NI, Unrealized Gains (Losses)	250	167
Equity securities	655	618
Non-redeemable preferred Stock
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	128	93
Equity Securities, FV-NI, Unrealized Gains (Losses)	5	1
Equity securities	133	94
Equity Securities
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	533	544
Equity Securities, FV-NI, Unrealized Gains (Losses)	255	168
Equity securities	$ 788	$ 712

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