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Summary of Significant Accounting Policies - Contract Balances (Details) $ in Millions	Dec. 31, 2018 USD ($)
Schedule Of Contract Assets And Liabilities [Line Items]
Deferred customer acquisition costs	$ 111
Accounts receivable, net	1,022
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)	392
Deferred revenues	67
Accounts receivable, net - Contracts with customers
Schedule Of Contract Assets And Liabilities [Line Items]
Accounts receivable, net	1,002
Accounts receivable, net - Derivative instruments
Schedule Of Contract Assets And Liabilities [Line Items]
Accounts receivable, net	$ 20

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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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