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Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense for acquired intangible assets | $ 163 | $ 159 | $ 158
Product development expenditures as percentage of total revenue | 8.00% | 8.00% | 8.00%
Amortization expense for intangible assets | $ 4 |  |
Customer related intangible assets | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 10 years |  |
Customer related intangible assets | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 20 years |  |
Acquired software and technology | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 4 years |  |
Acquired software and technology | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 8 years |  |
Trade names | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 8 years |  |
Trade names | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 20 years |  |
Capitalized software development costs |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 5 years |  |
Gross software development costs | $ 193 | $ 159 | $ 143
Amortization of previously capitalized software development costs | 137 | 123 | 106
Purchased software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense for intangible assets | $ 47 | $ 44 | $ 40
Purchased software | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 3 years |  |
Purchased software | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful lives | 5 years |  |
Acquired intangible assets |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2019 | $ 180 |  |
2020 | 160 |  |
2021 | 150 |  |
2022 | 150 |  |
2023 | 140 |  |
Capitalized and purchased software |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2019 | $ 210 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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