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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

X

- Definition

The total Universal Service Funds and other surcharges recorded gross in revenues that are billed to customers and remitted to governmental authorities.

+ References

No definition available.

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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

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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

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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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.

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