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Deferred Revenues
12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Deferred Revenues
Deferred Revenues
We record deferred revenues when cash payments are received or due in advance of the fulfillment of our associated performance obligations. The opening balance of deferred revenues as of January 1, 2018 and the ending balance as of December 31, 2018, were $1.8 billion and $1.6 billion, respectively, including our current and non-current balances. For the year ended December 31, 2018, the additions to our deferred revenues balance were primarily due to cash payments received or due in advance of satisfying our performance obligations, while the reductions to our deferred revenues balance were primarily due to the recognition of revenues upon fulfillment of our performance obligations, both of which were in the ordinary course of business. During the year ended December 31, 2018, $1.7 billion of revenues were recognized that were included in the deferred revenues balance at the beginning of the period.

As of December 31, 2018, the aggregate amount of contracted revenues allocated to our unsatisfied performance obligations is $2.9 billion, which includes our deferred revenues balances and amounts to be invoiced and recognized as revenue in future periods. We expect to recognize approximately $1.8 billion in 2019, $0.4 billion in 2020, and the remainder thereafter. This balance does not include an estimate for variable consideration arising from sales-based royalty license revenue in excess of the contractual minimum guarantee.