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Equipment Installment Plan Receivables, Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | $ 776 | $ 628
Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 737 | 591
Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 27 | 25
Equipment installment plan receivables, past due | 12 | 12
Lower Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 749 | 586
Lower Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 713 | 553
Lower Risk | Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 26 | 23
Equipment installment plan receivables, past due | 10 | 10
Higher Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 27 | 42
Higher Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 24 | 38
Higher Risk | Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 1 | 2
Equipment installment plan receivables, past due | $ 2 | $ 2

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- 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 + Details
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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 + Details
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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 + Details
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