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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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