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Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Schedule Of Contract Assets And Liabilities [Line Items] |  |  |  |  |
Deferred customer acquisition costs | $ 130 |  | $ 130 |  | $ 111
Total accounts receivable, net | 1,378 |  | 1,378 |  | 1,024
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) | 486 |  | 486 |  | 392
Deferred revenues | 78 |  | 78 |  | 67
Deferred revenue from contract with customers |  |  | 25 |  | 19
Revenue recognized | 21 | $ 19 | 13 | $ 16 |
Accounts receivable, net - Contracts with customers |  |  |  |  |
Schedule Of Contract Assets And Liabilities [Line Items] |  |  |  |  |
Total accounts receivable, net | 1,311 |  | 1,311 |  | 999
Accounts receivable, net - Derivative instruments |  |  |  |  |
Schedule Of Contract Assets And Liabilities [Line Items] |  |  |  |  |
Total accounts receivable, net | 63 |  | 63 |  | 20
Accounts receivable, net - Affiliate |  |  |  |  |
Schedule Of Contract Assets And Liabilities [Line Items] |  |  |  |  |
Total accounts receivable, net | $ 4 |  | $ 4 |  | $ 5

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- Definition Contract with Customer, Liability, Increase For Cash Payments Received + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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