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Revenue Contract Balance Rollforward (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Beginning Balance Deferred revenue - related parties $ 43
Ending Balance Deferred Revenue, Current, Related Parties 51
Beginning Balance Deferred Revenue, Noncurrent 42
Ending Balance Deferred Revenue, Noncurrent 80
Beginning Balance Deferred Revenue, Noncurrent, Related Parties 43
Ending Balance Deferred Revenue, Noncurrent, Related Parties 43
Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized (1)
Accounting Standards Update 2014-09 [Member]  
Beginning Balance Contract with Customer, Asset, Gross 4 [1]
Contract with Customer, Asset Increase (Decrease) 0
Contract with Customer, Asset, Reclassified to Receivable 0 [2]
Ending Balance Contract with Customer, Asset, Gross 4
Beginning Balance Deferred Revenue, Current 5 [1]
Deferred Revenue, Period Increase (Decrease) 8
Deferred Revenue, Revenue Recognized (9) [2]
Ending Balance Deferred Revenue, Current 4
Beginning Balance Deferred revenue - related parties 42 [1]
Deferred Revenue - Related Party, Period Increase (Decrease) 40
Deferred Revenue - Related Parties, Revenue Recognized (32) [2]
Ending Balance Deferred Revenue, Current, Related Parties 50
Beginning Balance Deferred Revenue, Noncurrent 5 [1]
Deferred Revenue, Noncurrent, Period Increase (Decrease) 5
Deferred Revenue, Noncurrent, Revenue Recognized 0 [2]
Ending Balance Deferred Revenue, Noncurrent 10
Beginning Balance Deferred Revenue, Noncurrent, Related Parties 43 [1]
Deferred Revenue, Noncurrent, Related Party, Period Increase (Decrease) (1)
Deferred Revenue, Noncurrent, Related Parties, Revenue Recognized 0 [2]
Ending Balance Deferred Revenue, Noncurrent, Related Parties $ 42
[1] Balance represents ASC 606 portion of each respective line item.
[2] $1 million revenue was recognized related to past performance obligations in the current year.