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NEW ACCOUNTING PRONOUNCEMENTS - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets $ 397  
Operating lease liabilities $ 395  
Accounting Standards Update 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets   $ 480
Operating lease liabilities   480
Retained Earnings | Accounting Standards Update 2018-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of certain tax effects   65
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of certain tax effects   $ (65)