Business Acquisitions, Goodwill, and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 2,110	$ 2,199
Accumulated Amortization	(1,698)	(1,722)
Trademarks and other	7	7
Intangible Assets, Gross (Excluding Goodwill), Total	2,117	2,206
Purchased service portfolios
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,025	2,123
Accumulated Amortization	(1,638)	(1,661)
Patents, trademarks/trade names
Finite-Lived Intangible Assets [Line Items]
Gross Amount	21	22
Accumulated Amortization	(17)	(16)
Customer relationships and other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	64	54
Accumulated Amortization	$ (43)	$ (45)