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Revenues (Contract liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract balances
Deferred contract revenues, recorded in other current liabilities	$ 90	$ 203
Deferred contract revenues, recorded in other long-term liabilities	408	422
Total contract liabilities	$ 498	$ 625	$ 625

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

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