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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Contract Acquisition Costs |  |
Revenue other than customer contracts (as a percent) | 1.00% | 1.00%
Deferred contract costs | $ 145 |
Long-term revenue contracts (as a percent) | 25.00% |
Weighted average remaining contract term | 4 years |
Deferred Sales Incentives [Member] |  |
Contract Acquisition Costs |  |
Deferred contract costs | $ 109 |
Selling, General and Administrative Expenses [Member] |  |
Contract Acquisition Costs |  |
Deferred contract costs amortization | 22 |
Reduction to Sales [Member] |  |
Contract Acquisition Costs |  |
Deferred contract costs amortization | $ 35 |
Minimum [Member] |  |
Contract Acquisition Costs |  |
Deferred revenue recognition period | 1 month |
Contract amortization period | 5 years |
Maximum [Member] |  |
Contract Acquisition Costs |  |
Deferred revenue recognition period | 3 months |
Contract amortization period | 13 years |

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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, after accumulated amortization and accumulated impairment loss, of 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 (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Deferred revenue recognition period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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