Revenue from Contracts with Customers - Receivables, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Accounts receivables, net	$ 173	$ 208
Current contract assets	0	1
Non-current contract assets	0	0
Current contract liabilities (deferred revenues)	(20)	(12)
Non-current contract liabilities (deferred revenues)	$ (9)	$ (9)

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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