Revenue Recognition Remaining Performance Obligations (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2018, our total RPO is $103.4 billion. Of this total, we expect approximately 45% will be recognized as sales over the following 24 months.