Segment Information - Depreciation and Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Depreciation	$ 13	$ 12
Held for sale	177		$ 0
Total assets	3,033		3,069
ASC
Segment Reporting Information [Line Items]
Depreciation	9	8
IMS
Segment Reporting Information [Line Items]
Depreciation	4	$ 4
Operating Segments | ASC
Segment Reporting Information [Line Items]
Assets, excluding assets held-for-sale	1,456		1,545
Operating Segments | IMS
Segment Reporting Information [Line Items]
Assets, excluding assets held-for-sale	1,143		1,145
Corporate & Eliminations
Segment Reporting Information [Line Items]
Assets, excluding assets held-for-sale	$ 257		$ 379