Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total Revenues		$ 9,066	$ 9,662	$ 9,991
Equipment
Disaggregation of Revenue [Line Items]
Total Revenues		2,062	2,178	2,152
Supplies, paper and other sales
Disaggregation of Revenue [Line Items]
Total Revenues		1,165	1,276	1,260
Maintenance agreements
Disaggregation of Revenue [Line Items]
Total Revenues		2,372	2,603	2,809
Service arrangements
Disaggregation of Revenue [Line Items]
Total Revenues		2,517	2,674	2,722
Rental and other
Disaggregation of Revenue [Line Items]
Total Revenues		706	663	754
Financing
Disaggregation of Revenue [Line Items]
Total Revenues		244	268	294
Sales
Disaggregation of Revenue [Line Items]
Total Revenues	[1]	3,227	3,454	3,412
Sales | Sales channels, direct equipment lease
Disaggregation of Revenue [Line Items]
Total Revenues		672	699	718
Sales | Sales channels, distributors and resellers
Disaggregation of Revenue [Line Items]
Total Revenues		1,343	1,445	1,502
Sales | Sales channels, customer direct
Disaggregation of Revenue [Line Items]
Total Revenues		1,212	1,310	1,192
Service
Disaggregation of Revenue [Line Items]
Total Revenues	[1]	5,595	5,940	6,285
United States
Disaggregation of Revenue [Line Items]
Total Revenues		5,429	5,610	5,790
Europe
Disaggregation of Revenue [Line Items]
Total Revenues		2,326	2,625	2,697
Canada
Disaggregation of Revenue [Line Items]
Total Revenues		518	569	648
Other
Disaggregation of Revenue [Line Items]
Total Revenues		$ 793	$ 858	856
Accounting Standards Update 2014-09 | Sales
Disaggregation of Revenue [Line Items]
Total Revenues				44
Accounting Standards Update 2014-09 | Service
Disaggregation of Revenue [Line Items]
Total Revenues				$ 44

[1] Certain prior year amounts have been conformed to the current year presentation. Refer to Note 1 - Basis of Presentation and Summary of Significant Accounting Policies for additional information.