Business Segments (Corporate Items) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues - divested/contributed businesses	$ 1,533	$ 1,535
Expenses:
Amortization expense of acquired intangible assets	38	40
Merger and strategic initiatives expense	2	15
Restructuring charges	18	0
Lease Asset Impairments	17
Operating loss	412	405
Corporate Items
Segment Reporting Information [Line Items]
Revenues - divested/contributed businesses	1	5
Expenses:
Amortization expense of acquired intangible assets	38	40
Merger and strategic initiatives expense	2	15
Restructuring charges	18	0
Lease Asset Impairments	17	0
Expenses - divested/contributed businesses	1	1
Other	(9)	4
Total expenses	67	60
Operating loss	$ (66)	$ (55)