LEASE COMMITMENTS - NARRATIVE (Details) - USD ($) $ in Millions	Dec. 31, 2019	Aug. 08, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 1,385
Lease liability	1,423	$ 488
Finance lease	398	86
Offshore And Onshore Drilling Rigs
Lessee, Lease, Description [Line Items]
Operating lease assets	217
Compressors
Lessee, Lease, Description [Line Items]
Operating lease assets	162
Other Field Equipment
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 389
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	9 years
Pipelines, Rail Cars, Storage Facilities, Easements And Real Estate
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 659
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	14 years
Oil And Gas Exploration And Development Equipment, Restate Offices, Compressors, And Field Equipment [Member]
Lessee, Lease, Description [Line Items]
Finance lease	$ 398
Anadarko Petroleum Corporation
Lessee, Lease, Description [Line Items]
Operating lease assets		503
Lease liability		$ 574
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease assets			$ 772