INCOME TAXES - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	0	161,000,000	$ 516,000,000
Increase (decrease) of valuation allowances	1,000,000,000.0	131,000,000	(1,600,000,000)
Net interest expense carryforward	735,000,000
Capital losses	626,000,000	636,000,000
Foreign tax credit carryforward, amount	2,241,000,000	2,241,000,000
Tax expense recorded for interest and penalties	1,000,000	1,000,000	0
Accrued for payment of interest and penalties	2,000,000	1,000,000	0
(Reduction) increase reserve for uncertain tax positions related to the current year	58,000,000	$ (2,000,000)	$ 11,000,000
U.S.
Income Tax [Line Items]
Operating loss carryforwards	8,052,000,000
Operating loss carryforwards subject to annual limitation	196,000,000
Capital losses	$ 1,800,000,000
Capital loss carryforward carryover period	5 years
Canada
Income Tax [Line Items]
Capital losses	$ 836,000,000