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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 13, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2017 | Sep. 30, 2015 | Dec. 31, 2013
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Deposit for performance guarantees |  | $ 0 | $ 5,000,000 |  |  |  |
Cash and cash equivalents |  | 683,000,000 | 682,000,000 | $ 493,000,000 |  |  | $ 548,000,000
Fair value of long-term debt |  | $ 183,000,000 | 30,000,000 |  |  |  |
Senior notes | $ 4,500,000,000 |  |  |  |  |  |
Interest expense recognition period |  | 10 years |  |  |  |  |
Unbilled receivables, current |  | $ 41,000,000 |  |  |  |  |
Accrued claims payable |  | 9,000,000 | 11,000,000 |  |  |  |
Accrued claims recoverable |  | 12,000,000 | 13,000,000 |  |  |  |
Check guarantee losses, net of anticipated recoveries excluding service fees |  | 40,000,000 | 49,000,000 | 57,000,000 |  |  |
Amount paid to merchant customers, net of amounts recovered from check writers |  | $ 32,000,000 | $ 41,000,000 | $ 52,000,000 |  |  |
Purchase of common shares, shares |  | 3 | 4 | 4 |  |  |
Sales Revenue, Net [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Concentration risk |  | 10.00% | 10.00% | 10.00% |  |  |
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Concentration risk |  | 24.00% | 22.00% | 22.00% |  |  |
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Processing Services [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Concentration risk |  | 67.00% | 75.00% | 75.00% |  |  |
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Professional Services [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Concentration risk |  | 15.00% | 14.00% | 15.00% |  |  |
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Software Licensing [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Concentration risk |  | 16.00% | 9.00% | 7.00% |  |  |
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Hardware and Other Miscellaneous [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Concentration risk |  | 2.00% | 2.00% | 3.00% |  |  |
Sales Revenue, Net, Software Licenses [Member] | Product Concentration Risk [Member] | Professional Services [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Concentration risk |  | 60.00% |  |  |  |  |
Software [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Estimated useful life |  | 5 years |  |  |  |  |
Software [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Estimated useful life |  | 10 years |  |  |  |  |
Building [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Estimated useful life |  | 30 years |  |  |  |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Estimated useful life |  | 3 years |  |  |  |  |
Furniture fixture and computer equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Estimated useful life |  | 7 years |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Expected customer attrition period |  | 10 years |  |  |  |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  | 5 years |  |  |  |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  | 10 years |  |  |  |  |
Software [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  | 3 years |  |  |  |  |
Software [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  | 10 years |  |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Notional amount |  | $ 143,000,000 | $ 81,000,000 |  |  |  |
Foreign Entities [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents |  | 470,000,000 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Unbilled receivables, current |  |  |  |  | $ 23,000,000 |  |
Cash Flow Hedging [Member] | Treasury Lock Hedge [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 1,000,000,000.0 |
Contract settlement payment | $ 16,000,000 |  |  |  |  |  |
Interest expense recognition period | 10 years |  |  |  |  |  |
Cash Flow Hedging [Member] | India, Rupees | Foreign Exchange Forward [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |  |  |  |
Notional amount |  | 7,000,000 |  |  |  |  |
Derivative fair value |  | $ 1,000,000 |  |  |  |  |

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