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Revenue Contract Balances (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Deferred revenue - related parties, beginning balance $ 43
Deferred revenue - related parties, ending balance 43
Long-term deferred revenue, beginning balance 42
Long-term deferred revenue, ending balance 49
Long-term deferred revenue - related parties, beginning balance 43
Long-term deferred revenue - related parties, ending balance 49
Liability, change in timeframe, performance obligation satisfied, revenue recognized 0
ASC 606  
Contract assets, beginning balance 4 [1]
Contract assets, additions/(deletions) 0
Contract assets, revenue recognized 0 [2]
Contract assets, ending balance 4
Deferred revenue, beginning balance 5 [1]
Deferred revenue, additions/(deletions) 2
Deferred revenue, revenue recognized (2) [2]
Deferred revenue, ending balance 5
Deferred revenue - related parties, beginning balance 42 [1]
Deferred revenue - related party, additions/(deletions) 9
Deferred revenue - related parties, revenue recognized (9) [2]
Deferred revenue - related parties, ending balance 42
Long-term deferred revenue, beginning balance 7 [1]
Long-term deferred revenue, additions/(deletions) 1
Long-term deferred revenue, revenue recognized 0 [2]
Long-term deferred revenue, ending balance 8
Long-term deferred revenue - related parties, beginning balance 39 [1]
Long-term deferred revenue - related party, additions/(deletions) 6
Long-term deferred revenue - related parties, revenue recognized 0 [2]
Long-term deferred revenue - related parties, ending balance $ 45
[1] Balance represents ASC 606 portion of each respective line items.
[2] No revenue was recognized related to past performance obligations, in the current period. Changes in long-term amounts represent reclassifications to current balances.