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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 3,948 | $ 3,901
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,961 | 2,912
Transferred over time | Retail service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,650 | 2,623
Transferred over time | Inbound roaming |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 174 | 154
Transferred over time | Other service |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 137 | 135
Transferred at point in time | Equipment sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 987 | $ 989

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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