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SUPPLEMENTAL FINANCIAL INFORMATION - Prepaid Expenses and Other (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Prepaid expenses and other    
Prepaid value added taxes $ 163 $ 140
Prepaid income taxes 183 164
Other 342 315
Prepaid expenses and other current assets $ 688 $ 619