Investments (Other Invested Assets - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Carrying value of Tax Credits	$ 518	$ 759
Losses From Tax Credits	$ 145	$ 174	$ 195