REVENUE - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Percentage of revenue from product sales	98.00%	99.00%	99.00%
Contract liability	$ 40	$ 41
Accrued Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Current	5	4
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Noncurrent	$ 35	$ 37
Maximum [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	21 years