Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Operating lease assets	$ 69	$ 67
Finance lease assets	5	8
Total leased assets	$ 74	$ 75
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other, net	Other, net
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net of accumulated depreciation of $6,879 and $8,347	Property, plant and equipment, net of accumulated depreciation of $6,879 and $8,347
Current
Operating	$ 33	$ 28
Finance	$ 1	$ 1
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other	Other
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current maturities of long-term debt	Current maturities of long-term debt
Noncurrent
Operating	$ 63	$ 76
Finance	1	4
Total lease liabilities	$ 98	$ 109
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other	Other
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	LONG-TERM DEBT	LONG-TERM DEBT
Weighted-average remaining lease term (years)
Operating leases	4 years 2 months 12 days	4 years 4 months 24 days
Finance leases	6 years 3 months 18 days	6 years 3 months 18 days
Weighted-average discount rate
Operating leases	3.97%	4.71%
Finance leases	6.21%	6.62%