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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |
Amounts recorded gross in revenues that are billed to customers and remitted to governmental authorities | $ 78 | $ 90 | $ 80 |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Cumulative effect of accounting changes |  | 2 | 195 |
Capitalized contract cost |  |  |  |
Amortization of contract cost assets | 126 | 124 |  |
Revenue recognized | $ 164 |  |  |
Retained earnings |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Cumulative effect of accounting changes |  | $ 2 | $ 165 |
ASC 606 | Retained earnings |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Cumulative effect of accounting changes |  |  |  | $ 164

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- Definition Amount of amortization expense for 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 (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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