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Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
country
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information      
Assets from discontinued operations, excluded from total assets $ 0 $ 2 $ 6
Foreign Entities      
Segment Reporting Information      
Long-term assets, excluding goodwill and other intangible assets 560 559  
SunGard      
Segment Reporting Information      
Acquisition, integration and other costs $ 156 $ 178 $ 281
GFS      
Segment Reporting Information      
Number of countries in which entity operates (more than) | country 130