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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Life insurance, corporate or bank owned, amount $ 872   $ 944
Cumulative effect of new accounting principle in period of adoption   $ (30)  
Accounting Standards Update 2016-13      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Cumulative effect of new accounting principle in period of adoption   40  
Retained Earnings      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Cumulative effect of new accounting principle in period of adoption   $ (30)  
Equity real estate | Minimum      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Property, plant and equipment, useful life 40 years    
Equity real estate | Maximum      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Property, plant and equipment, useful life 50 years