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Divestitures - (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2017
Feb. 01, 2017
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Proceeds from sale of business     $ 49 $ 827
Capco Consulting Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Ownership percentage 40.00%      
Preferred unit dividend rate 12.00%      
Equity method investment $ 172      
Disposal group, disposed of by sale, not discontinued operations | Capco Consulting Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Proceeds from sale of business 469      
Gain (loss) on assets sold $ (41)      
Ownership percentage by noncontrolling owners 60.00%      
Pre-tax earnings       4
Disposal group, disposed of by sale, not discontinued operations | SunGard Public Sector and Education        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations        
Proceeds from sale of business   $ 500    
Gain (loss) on assets sold   85    
Pre-tax earnings       $ 3
Consideration received   $ 850