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Equipment Installment Plan Receivables, Gross Receivables by Credit Category (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | $ 871 | $ 873
Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 828 | 827
Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 29 | 32
Equipment installment plan receivables, past due | 14 | 14
Lower Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 849 | 850
Lower Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 809 | 807
Lower Risk | Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 28 | 31
Equipment installment plan receivables, past due | 12 | 12
Higher Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables, gross | 22 | 23
Higher Risk | Unbilled |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 19 | 20
Higher Risk | Billed |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Equipment installment plan receivables | 1 | 1
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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