SIGNIFICANT ACCOUNTING POLICIES - Reclassification of DAC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of deferred policy acquisition costs	$ 144	$ 182	$ 309	$ 391
Reclassification Of DAC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total reductions		(146)		(281)
Amortization of deferred policy acquisition costs		146		281
Reclassification Of DAC | Compensation and benefits
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total reductions		32		65
Reclassification Of DAC | Commissions
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total reductions		112		213
Reclassification Of DAC | Other operating costs and expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total reductions		$ 2		$ 3