Revenue Recognition Remaining Performance Obligations (Tables)

12 Months Ended

Dec. 31, 2018

Remaining Performance Obligations [Abstract]

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

Remaining performance obligations ("RPO") are the aggregate amount of total contract transaction price that is unsatisfied or partially unsatisfied. As of December 31, 2018, our total RPO is approximately $115.5 billion. Of this total, we expect approximately 46% will be recognized as sales over the following 24 months.