Insurance (Aggregate FV of Assets Supporting Separate Accounts) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Separate Account, Liability [Line Items]
Separate account assets	$ 81,124	$ 78,880
Equity securities
Separate Account, Liability [Line Items]
Separate account assets	80,848	78,583
Fixed maturity securities
Separate Account, Liability [Line Items]
Separate account assets	259	277
Cash and cash equivalents
Separate Account, Liability [Line Items]
Separate account assets	9	9
Other
Separate Account, Liability [Line Items]
Separate account assets	$ 8	$ 11