Revenue - Summary of Changes in Contract Liabilities (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Deferred revenues (1)	[1]	$ 44	$ 48
Amounts recognized in revenues	[1]	$ 23

[1] Deferred revenues includes deferred revenue—affiliated companies. This amount is included in Other current liabilities and Other long-term liabilities.