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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Variable Interest Entity [Line Items]        
Amortization of deferred policy acquisition costs $ 144 $ 182 $ 309 $ 391
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Variable Interest Entity, nonconsolidated net assets 169,700   169,700  
Variable interest, maximum loss exposure 1,100   1,100  
Variable interest entity, unused commitments 885   885  
Variable interest entity, consolidated, assets 1,100   1,100  
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Variable interest entity, consolidated, assets $ 34   34  
Operating income (loss)     $ 14