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Acquisitions (Narrative) (Details) - SunGard [Member] - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Nov. 30, 2015
Dec. 31, 2016
Business Acquisition [Line Items]    
Percentage of equity interests acquired 100.00%  
Increase (decrease) in income due to additional depreciation and amortization that would have been recognized in 2015   $ (5)
Gross contractual receivables $ 546  
Restricted Stock [Member]    
Business Acquisition [Line Items]    
Stock granted, share-based compensation (in shares) 2