LEASE COMMITMENTS - NARRATIVE (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 1,062	$ 1,411
Finance lease	358
Offshore And Onshore Drilling Rigs
Lessee, Lease, Description [Line Items]
Operating lease assets	45
Compressors
Lessee, Lease, Description [Line Items]
Operating lease assets	140
Storage Facilities
Lessee, Lease, Description [Line Items]
Operating lease assets	253
Office Space
Lessee, Lease, Description [Line Items]
Operating lease assets	406
Other Field Equipment
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 57
Oil And Gas Exploration And Development Equipment | Low end of range
Lessee, Lease, Description [Line Items]
Contract expiration term	2 years
Oil And Gas Exploration And Development Equipment | High end of range
Lessee, Lease, Description [Line Items]
Contract expiration term	8 years
Pipelines, Rail Cars, Storage Facilities, Easements And Real Estate
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 213
Real Estate Leases | Low end of range
Lessee, Lease, Description [Line Items]
Contract expiration term	1 year
Real Estate Leases | High end of range
Lessee, Lease, Description [Line Items]
Contract expiration term	13 years