Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total Revenues	$ 1,767	$ 2,179	$ 5,092	$ 6,622
Equipment
Disaggregation of Revenue [Line Items]
Total Revenues	419	494	1,054	1,446
Supplies, paper and other sales
Disaggregation of Revenue [Line Items]
Total Revenues	232	290	622	862
Maintenance agreements
Disaggregation of Revenue [Line Items]
Total Revenues	443	567	1,338	1,774
Service arrangements
Disaggregation of Revenue [Line Items]
Total Revenues	486	611	1,512	1,883
Rental and other
Disaggregation of Revenue [Line Items]
Total Revenues	132	157	396	473
Financing
Disaggregation of Revenue [Line Items]
Total Revenues	55	60	170	184
Sales
Disaggregation of Revenue [Line Items]
Total Revenues	651	784	1,676	2,308
Sales | Direct equipment lease
Disaggregation of Revenue [Line Items]
Total Revenues	151	200	388	484
Sales | Distributors & resellers
Disaggregation of Revenue [Line Items]
Total Revenues	245	301	604	949
Sales | Customer direct
Disaggregation of Revenue [Line Items]
Total Revenues	255	283	684	875
United States
Disaggregation of Revenue [Line Items]
Total Revenues	1,062	1,343	3,101	3,955
Europe
Disaggregation of Revenue [Line Items]
Total Revenues	480	521	1,317	1,705
Canada
Disaggregation of Revenue [Line Items]
Total Revenues	94	123	278	377
Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 131	$ 192	$ 396	$ 585