Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenues	$ 7,022	$ 9,066	$ 9,662
Equipment
Disaggregation of Revenue [Line Items]
Total Revenues	1,564	2,062	2,178
Supplies, paper and other sales
Disaggregation of Revenue [Line Items]
Total Revenues	885	1,165	1,276
Maintenance agreements
Disaggregation of Revenue [Line Items]
Total Revenues	1,803	2,372	2,603
Service arrangements
Disaggregation of Revenue [Line Items]
Total Revenues	2,014	2,517	2,674
Rental and other
Disaggregation of Revenue [Line Items]
Total Revenues	530	706	663
Financing
Disaggregation of Revenue [Line Items]
Total Revenues	226	244	268
Sales
Disaggregation of Revenue [Line Items]
Total Revenues	2,449	3,227	3,454
Sales | Sales channels, direct equipment lease
Disaggregation of Revenue [Line Items]
Total Revenues	573	672	699
Sales | Sales channels, distributors and resellers
Disaggregation of Revenue [Line Items]
Total Revenues	910	1,343	1,445
Sales | Customer direct
Disaggregation of Revenue [Line Items]
Total Revenues	966	1,212	1,310
United States
Disaggregation of Revenue [Line Items]
Total Revenues	4,186	5,429	5,610
Europe
Disaggregation of Revenue [Line Items]
Total Revenues	1,883	2,326	2,625
Canada
Disaggregation of Revenue [Line Items]
Total Revenues	393	518	569
Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 560	$ 793	$ 858