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Revenues (Contract liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Contract balances
Deferred contract revenues, recorded in other current liabilities	$ 113	$ 100
Deferred contract revenues, recorded in other long-term liabilities	421	429
Total contract liabilities	$ 534	$ 529	$ 487	$ 486

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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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-Publisher FASB
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