Acquisitions and Dispositions of Businesses - Completed Dispositions (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) disposition	Sep. 30, 2022 USD ($) disposition	Sep. 30, 2023 USD ($) disposition	Sep. 30, 2022 USD ($) disposition	Dec. 31, 2022 USD ($)
Business Combination and Asset Acquisition [Abstract]
Number of dispositions | disposition	0	0	0	3
Gain from sales of businesses	$ 0	$ 6	$ 0	$ 53
Assets held for sale	277		277		$ 0
Liabilities held for sale	$ 40		$ 40		$ 0