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Equipment Installment Plan Receivables, Gross Receivables by Credit Category (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables, gross	$ 873	$ 628
Unbilled
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables	827	591
Billed
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables	32	25
Equipment installment plan receivables, past due	14	12
Lower Risk
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables, gross	850	586
Lower Risk | Unbilled
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables	807	553
Lower Risk | Billed
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables	31	23
Equipment installment plan receivables, past due	12	10
Higher Risk
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables, gross	23	42
Higher Risk | Unbilled
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables	20	38
Higher Risk | Billed
Financing Receivable, Recorded Investment [Line Items]
Equipment installment plan receivables	1	2
Equipment installment plan receivables, past due	$ 2	$ 2

X

- Definition

Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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- Definition

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+ References

No definition available.

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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