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LEASES - Right-of-use Assets and Right-of-use Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Right-of-use assets included in:    
Other non-current assets $ 274 $ 302
Lease liabilities included in:    
Accrued and other current liabilities 55  
Other non-current liabilities 238  
Total lease liabilities $ 293 $ 302