Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Operating lease assets	$ 1,182	$ 1,091
Finance lease assets	231	235
Total leased assets	$ 1,413	$ 1,326
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other, net	Other, net
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net of accumulated depreciation $3,202 and $2,818	Property, plant and equipment, net of accumulated depreciation $3,202 and $2,818
Current
Operating	$ 299	$ 241
Finance	16	14
Noncurrent
Operating	953	903
Finance	226	241
Total lease liabilities	$ 1,494	$ 1,399
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current maturities of long-term debt	Current maturities of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	LONG-TERM DEBT	LONG-TERM DEBT
Weighted-average remaining lease term (years)
Operating leases	6 years 10 months 24 days	7 years 2 months 12 days
Finance leases	11 years 1 month 6 days	12 years 6 months
Weighted-average discount rate
Operating leases	4.79%	5.85%
Finance leases	4.81%	5.01%
Affiliated Entity
Assets
Operating lease assets	$ 294	$ 83
Current
Operating	82	31
Noncurrent
Operating	$ 224	$ 65