INCOME TAXES - Reconciliation of Tax of Income Before Income Taxes and Total Tax Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at U.S. statutory rate	$ 201	$ 321	$ (589)
State income tax, less federal effect	2	(6)	(19)
Taxes related to foreign operations	436	(105)	303
Tax credits	(13)	(33)	(1)
Tax on distributed foreign earnings	0	0	80
Tax on deemed repatriation of foreign earnings	103	419	0
Foreign tax credits	(336)	(201)	(136)
Deferred tax on undistributed foreign earnings	0	(1,872)	(31)
Change in U.K. tax rate	0	0	(238)
Change in U.S. tax rate	161	516	0
Net change in tax contingencies	(2)	(1)	(19)
Canadian USD functional currency election	0	0	158
Sale of Canadian assets	0	279	0
Sale of North Sea assets	(30)	(48)	0
Valuation allowances	118	161	10
All other, net	32	(15)	40
Total	$ 672	$ (585)	$ (442)