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Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of gross amounts of unrecognized gross tax benefits    
Amount of unrecognized tax benefits, beginning balance $ 98 $ 18
Assumed in SunGard acquisition   82
Increases as a result of tax positions taken in the current period 2 1
Increases as a result of tax positions taken in a prior period 14 2
Amount of decreases due to lapse of the applicable statute of limitations (4) (5)
Amount of decreases due to settlements (23)  
Amount of unrecognized tax benefits, ending balance $ 87 $ 98