Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other current liabilities
Accrued payroll and employee benefits	$ 224	$ 207
Accrued interest	128	169
Accrued taxes, other than income	66	73
Finance lease liability	$ 37	$ 35
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total other current liabilities	Total other current liabilities
Operating lease liability	$ 8	$ 13
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total other current liabilities	Total other current liabilities
Deferred revenues	$ 133	$ 100
Contingent liabilities	60	180
Other	3	4
Total other current liabilities	659	781
Other long-term liabilities
Postemployment benefit plan obligations	272	346
Finance lease noncurrent	$ 407	$ 444
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Total other long-term liabilities	Total other long-term liabilities
Operating leases noncurrent	$ 114	$ 116
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Total other long-term liabilities	Total other long-term liabilities
Income taxes payable	$ 202	$ 179
Deferred revenues	323	429
Other	48	41
Total other long-term liabilities	$ 1,366	$ 1,555