Goodwill, Customer Relationships and Other Intangible Assets - Rollforward Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill Activity
As of beginning of period		$ 9,360	$ 9,360
Impairment	$ (2,400)	(2,405)	0	$ 0
As of end of period		6,955	$ 9,360	$ 9,360
Goodwill, Impaired, Accumulated Impairment Loss		$ 2,400