INCOME TAXES - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax [Line Items]
Provisional deferred tax expense attributable to deemed repatriation of foreign earnings required under the Act		$ 419,000,000
Measurement period adjustment, additional deferred tax expense under the Act	$ 103,000,000
Increase of net operating losses related to the Act	1,200,000,000
Incremental deferred tax expenses associated with change in U.S. tax rate	161,000,000	516,000,000	$ 0
Deferred tax benefit	159,000,000	170,000,000	576,000,000
Increase (decrease) of valuation allowances	131,000,000	(1,600,000,000)	(33,000,000)
Net interest expense carryforward	289,000,000
Capital losses	636,000,000	620,000,000
Foreign tax credit carryforward, amount	2,241,000,000	2,427,000,000
Tax expense recorded for interest and penalties	1,000,000	0	0
Accrued for payment of interest and penalties	1,000,000	0	0
(Reduction) increase reserve for uncertain tax positions related to the current year	(2,000,000)	$ 11,000,000	$ (4,000,000)
U.S.
Income Tax [Line Items]
Operating loss carryforwards	5,888,000,000
Operating loss carryforwards subject to annual limitation	197,000,000
Capital losses	$ 1,800,000,000
Capital loss carryforward carryover period	5 years
Canada
Income Tax [Line Items]
Capital losses	$ 836,000,000
Her Majesty's Revenue and Customs (HMRC)
Income Tax [Line Items]
Supplementary charge, percent			10.00%	20.00%
Deferred tax benefit			$ 238,000,000