Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total Revenues	$ 1,465	$ 2,263	$ 3,325	$ 4,443
Equipment
Disaggregation of Revenue [Line Items]
Total Revenues	310	504	635	952
Supplies, paper and other sales
Disaggregation of Revenue [Line Items]
Total Revenues	150	296	390	572
Maintenance agreements
Disaggregation of Revenue [Line Items]
Total Revenues	366	609	895	1,207
Service arrangements
Disaggregation of Revenue [Line Items]
Total Revenues	460	637	1,026	1,272
Rental and other
Disaggregation of Revenue [Line Items]
Total Revenues	123	156	264	316
Financing
Disaggregation of Revenue [Line Items]
Total Revenues	56	61	115	124
Sales
Disaggregation of Revenue [Line Items]
Total Revenues	460	800	1,025	1,524
Sales | Direct equipment lease
Disaggregation of Revenue [Line Items]
Total Revenues	111	150	237	284
Sales | Distributors & resellers
Disaggregation of Revenue [Line Items]
Total Revenues	136	333	359	648
Sales | Customer direct
Disaggregation of Revenue [Line Items]
Total Revenues	213	317	429	592
United States
Disaggregation of Revenue [Line Items]
Total Revenues	925	1,344	2,039	2,612
Europe
Disaggregation of Revenue [Line Items]
Total Revenues	356	584	837	1,184
Canada
Disaggregation of Revenue [Line Items]
Total Revenues	76	130	184	254
Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 108	$ 205	$ 265	$ 393