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Summary of Significant Accounting Policies - Contract Balances (Details) $ in Millions | Dec. 31, 2018 USD ($)
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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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