Goodwill, Customer Relationships and Other Intangible Assets - Goodwill Activity (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 1,970	$ 6,666
Reclassified as held for sale			(58)
Effect of foreign currency exchange rate changes and other			(4,638)
Goodwill impairment	$ (2,000)	(1,970)	(4,638)	$ 0
Goodwill, ending balance		0	1,970	6,666
Goodwill, accumulated impairment loss		$ 10,200	$ 8,200	$ 3,600