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REVENUE RECOGNITION - Schedule of Changes in Deferred Revenue Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Movement in Deferred Revenue [Roll Forward]    
Beginning balance $ 248 $ 227
Customer deposits and billings 440 463
Revenue recognized in the period (440) (443)
Translation 5 (3)
Ending balance $ 253 $ 244