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Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Contract Assets And Liabilities [Line Items] |  |
Deferred customer acquisition costs | $ 113 | $ 133
Accounts receivable, net | 904 | 1,025
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) | 393 | 402
Deferred revenue | 60 | 82
Deferred revenue from contract with customers | 31 | 24
Revenue recognized | 13 | 13
Accounts receivable, net - Contracts with customers |  |
Schedule Of Contract Assets And Liabilities [Line Items] |  |
Accounts receivable, net | 866 | 1,002
Accounts receivable, net - Derivative instruments |  |
Schedule Of Contract Assets And Liabilities [Line Items] |  |
Accounts receivable, net | 33 | 18
Accounts receivable, net - Affiliate |  |
Schedule Of Contract Assets And Liabilities [Line Items] |  |
Accounts receivable, net | $ 5 | $ 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 [Line Items] for Schedule Of Contract Assets And Liabilities [Table] + 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=120391452&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=120400017&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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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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