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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) $ in Millions	Sep. 30, 2018 USD ($)
Schedule Of Contract Assets And Liabilities [Line Items]
Deferred customer acquisition costs	$ 104
Total accounts receivable, net	1,297
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)	385
Deferred revenues	60
Accounts receivable, net - Contracts with customers
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	1,265
Accounts receivable, net - Derivative instruments
Schedule Of Contract Assets And Liabilities [Line Items]
Total accounts receivable, net	$ 32

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[Line Items] for Schedule Of Contract Assets And Liabilities [Table]

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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