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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Operating lease, right-of-use asset $ 511 $ 500 $ 0
Present value of lease liabilities $ 559 550  
Deferred rent   $ 50