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SUPPLEMENTAL FINANCIAL INFORMATION - Prepaid Expenses and Other (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Prepaid expenses and other              
Prepaid value added taxes $ 140     $ 131      
Prepaid income taxes 90     79      
Other 389     404      
Prepaid expenses and other current assets $ 619 $ 642 $ 614 $ 614 $ 615 $ 621 $ 610