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Revenue Recognition, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018
Revenue, Practical Expedient [Abstract] |  |  |  |
Revenue recognition completed contract, practical expedient |  | false |  |
Revenue recognition [Line Items] |  |  |  |
Cumulative effect of accounting changes | $ 193 | $ 193 |  |
Bad debts expense |  | $ 43 | $ 49 |
Capitalized contract cost |  |  |  |
Capitalized contract cost, amortization method |  | Capitalized commission fees and fulfillment costs are amortized based on the transfer of the goods or services to which the assets relate, typically the contract term which ranges from thirteen months to five years. |  |
Amortization of contract cost assets | 30 | $ 62 |  |
Impairment of capitalized contract cost | 0 | 0 |  |
Retained earnings |  |  |  |
Revenue recognition [Line Items] |  |  |  |
Cumulative effect of accounting changes | 163 | 163 |  |
Revenue from contract with customer |  |  |  |
Revenue recognition [Line Items] |  |  |  |
Bad debts expense | $ 23 | $ 43 |  |
ASU 2014-09 | Retained earnings |  |  |  |
Revenue recognition [Line Items] |  |  |  |
Cumulative effect of accounting changes |  |  |  | $ 163
ASU 2017-05 | Retained earnings |  |  |  |
Revenue recognition [Line Items] |  |  |  |
Cumulative effect of accounting changes |  |  |  | $ 0

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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/presentationRef -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 + Details
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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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