Summary of Significant Accounting Policies Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Asset Impairment Charges	$ 0	$ 0
Other
Goodwill [Line Items]
Asset Impairment Charges			$ (5)