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Commitments and Contingencies (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) claim
Secretariat of the Federal Revenue Bureau of Brazil [Member] | Pending litigation [Member] | Potential tax liability [Member] |
Loss Contingencies [Line Items] |
Loss contingency, number of claims pending | claim | 11
Loss contingency, value of damages sought | $ 15
Loss contingency, number of additional claims filed | claim | 24
Loss contingency, potential additional claims amount sought | $ 56
Number of total pending and potential pending claims | claim | 35
Secretariat of the Federal Revenue Bureau of Brazil [Member] | Pending litigation [Member] | Potential tax liability [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Loss contingency, estimate of possible loss | $ 71
SunGard [Member] |
Loss Contingencies [Line Items] |
Liability for acquired contingencies | $ 75

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