Revenue Contract Balances (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Long-term deferred revenue, beginning balance		$ 217
Long-term deferred revenue, ending balance		291
Liability, change in timeframe, performance obligation satisfied, revenue recognized		0	$ 0
ASC 606
Contract assets, beginning balance	[1]	39	36
Contract assets, additions/(deletions)		(9)	(6)
Contract assets, revenue recognized	[2]	(1)	(2)
Contract assets, ending balance		29	28
Deferred revenue, beginning balance	[1]	23	13
Deferred revenue, additions/(deletions)		16	11
Deferred revenue, revenue recognized	[2]	(6)	(4)
Deferred revenue, ending balance		33	20
Deferred revenue - related parties, beginning balance	[1]	53	65
Deferred revenue - related party, additions/(deletions)		77	34
Deferred revenue - related parties, revenue recognized	[2]	(60)	(50)
Deferred revenue - related parties, ending balance		70	49
Long-term deferred revenue, beginning balance	[1]	90	56
Long-term deferred revenue, additions/(deletions)		25	26
Long-term deferred revenue, revenue recognized	[2]	0	0
Long-term deferred revenue, ending balance		115	82
Long-term deferred revenue - related parties, beginning balance	[1]	55	52
Long-term deferred revenue - related party, additions/(deletions)		(7)	5
Long-term deferred revenue - related parties, revenue recognized	[2]	0	0
Long-term deferred revenue - related parties, ending balance		$ 48	$ 57

[1] Balance represents ASC 606 portion of each respective line item.

[2] No significant revenue was recognized related to past performance obligations in the current periods.