COMMITMENTS AND CONTINGENCIES - Contractual Obligations (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Oil and Gas Delivery Commitments and Contracts [Line Items]
Total	$ 2,755
2019	384
2020-2021	563
2022-2023	503
2024 & Beyond	$ 1,305
Capital leases imputed interest rate	4.40%
Capital leases future minimum payments due	$ 16
Drilling rigs
Oil and Gas Delivery Commitments and Contracts [Line Items]
Total	172
2019	102
2020-2021	69
2022-2023	1
2024 & Beyond	0
Purchase obligations
Oil and Gas Delivery Commitments and Contracts [Line Items]
Total	2,323
2019	220
2020-2021	427
2022-2023	445
2024 & Beyond	1,231
Operating lease obligations
Oil and Gas Delivery Commitments and Contracts [Line Items]
Total	220
2019	61
2020-2021	64
2022-2023	53
2024 & Beyond	42
Capital lease obligations
Oil and Gas Delivery Commitments and Contracts [Line Items]
Total	40
2019	1
2020-2021	3
2022-2023	4
2024 & Beyond	$ 32