Revenue (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Advanced billings, revenue recognized	$ 49
Lease transactions	$ 7	$ 7
Business services | Minimum
Disaggregation of Revenue [Line Items]
Period of recognition	1 year
Business services | Maximum
Disaggregation of Revenue [Line Items]
Period of recognition	5 years
Support services | Minimum
Disaggregation of Revenue [Line Items]
Period of recognition	1 year
Support services | Maximum
Disaggregation of Revenue [Line Items]
Period of recognition	5 years
SendTech Solutions
Disaggregation of Revenue [Line Items]
Expected timing of satisfaction period, not included (less then)	12 months