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Revenue Recognition - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) category | Mar. 31, 2020 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue recognized | $ | $ 425 | $ 495
Minimum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract term | 1 year |
Maximum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract term | 5 years |
Weighted Average | Consumer Customers |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Length of customer life | 30 months |
Weighted Average | Business Customers |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Length of customer life | 30 months |
Business |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Number of categories of products and services | 4 |
Mass Markets |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Number of categories of products and services | 4 |

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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=121604090&loc=SL49130549-203045 + Details
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