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Segment Information (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) segment country | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | segment | 3 |  |
Assets from discontinued operations, excluded from total assets | $ 2 | $ 6 | $ 1
Global Financial Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of countries in which entity operates (more than) | country | 130 |  |
Severance costs |  |  | 45
SunGard [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition, integration and severance costs | $ 178 | $ 281 |
Sungard and recent acquisitions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Acquisition, integration and severance costs |  |  | $ 171
Sales Revenue, Net [Member] | Geographic concentration risk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk | 27.00% | 29.00% | 24.00%
International [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long-term assets, excluding goodwill and other intangible assets | $ 559 | $ 510 |

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