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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Capitalized Contract Cost |  |  |  |  |
Capitalized contract cost related to commission fees | $ 131 |  | $ 131 |  | $ 139
Amortization of contract cost assets | $ 27 | $ 26 | $ 55 | $ 54 |
Minimum |  |  |  |  |
Capitalized Contract Cost |  |  |  |  |
Capitalized contract cost, amortization period | 15 months |  | 15 months |  |
Maximum |  |  |  |  |
Capitalized Contract Cost |  |  |  |  |
Capitalized contract cost, amortization period | 30 months |  | 30 months |  |

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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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