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Long-Term Debt (Narrative) (Details) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 25, 2017 USD ($) | Jul. 10, 2017 USD ($) | Mar. 15, 2017 USD ($) | Aug. 11, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jul. 31, 2017 GBP (£) | Jul. 31, 2017 EUR (€) | Jul. 10, 2017 GBP (£) | Jul. 10, 2017 EUR (€) | Jul. 10, 2017 € / $ | Jul. 10, 2017 £ / $
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 196,000,000 | $ 0 | $ 0 |  |  |  |  |  |
Debt issuance costs |  |  |  |  | 53,000,000 |  |  |  |  |  |  |  |
Fair value of long-term debt |  |  |  |  | 156,000,000 | $ 183,000,000 |  |  |  |  |  |  |
FIS Credit Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount (premium), net |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  | $ 53,000,000 |  |  |  |  |  |  |  |
Senior Notes due 2021, interest payable semi-annually at 2.250% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 2.25% |  |  |  |  |  |  |  |
Senior Notes due 2026, interest payable semi-annually at 3.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Senior Notes due 2046, interest payable semi-annually at 4.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 4.50% |  |  |  |  |  |  |  |
Senior Notes due March 2022, interest payable semi-annually at 5.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  |  | 5.00% |  |  |  |  |  |  |
Senior Euro Notes due 2021, interest payable annually at 0.400% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 0.40% |  |  |  |  |  |  |  |
Senior GBP Notes due 2022, interest payable annually at 1.700% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 1.70% |  |  |  |  |  |  |  |
Senior Euro Notes due 2024, interest payable annually at 1.100% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 1.10% |  |  |  |  |  |  |  |
Senior Notes due October 2020, interest payable semi-annually at 3.625% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 3.625% |  |  |  |  |  |  |  |
Senior Notes due October 2025, interest payable semi-annually at 5.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
Senior Notes due October 2022, interest payable semi-annually at 4.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 4.50% |  |  |  |  |  |  |  |
Senior Notes due 2024, interest payable semi-annually at 3.875% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 3.875% |  |  |  |  |  |  |  |
Senior Notes due 2023, interest payable semi-annually at 3.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 3.50% |  |  |  |  |  |  |  |
Senior Notes due April 2018, interest payable semi-annually at 2.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Senior Notes due October 2018, interest payable semi-annually at 2.850% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  | 2.85% |  |  |  |  |  |  |  |
Revolving Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility outstanding amount |  |  |  |  | $ 195,000,000 |  |  |  |  |  |  |  |
Additional term and revolving loan capacity in the future |  |  |  |  | 2,799,000,000 |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount redeemed | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | 171,000,000 |  |  |  |  |  |  |  |
Weighted average interest rate | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Tender offer costs | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Revolving Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of revolving loan | $ 469,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 2021 Notes, 2026 Notes, and 2046 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior notes |  |  |  | 2,461,000,000 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2021, interest payable semi-annually at 2.250% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  | 2.25% |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2026, interest payable semi-annually at 3.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount |  |  |  | $ 1,250,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2046, interest payable semi-annually at 4.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  | 4.50% |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due March 2022, interest payable semi-annually at 5.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Amount redeemed |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 2021 and 2024 Euro Notes and 2022 GBP Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount |  |  |  |  |  |  |  |  |  | £ 300,000,000 | € 1,000,000,000 |  |
Net proceeds from offering |  | $ 1,491,000,000 |  |  |  |  |  |  |  |  |  |  |
Currency conversion rate |  |  |  |  |  |  |  |  |  |  |  | 1.12 | 1.27
Deferred financing costs, gross |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Euro Notes due 2021, interest payable annually at 0.400% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount | € |  |  |  |  |  |  |  |  | € 500,000,000 |  | 500,000,000 |  |
Debt instrument, stated percentage |  | 0.40% |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior GBP Notes due 2022, interest payable annually at 1.700% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount | £ |  |  |  |  |  |  |  | £ 300,000,000 |  | £ 300,000,000 |  |  |
Debt instrument, stated percentage |  | 1.70% |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Euro Notes due 2024, interest payable annually at 1.100% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount | € |  |  |  |  |  |  |  |  |  |  | € 500,000,000 |  |
Debt instrument, stated percentage |  | 1.10% |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due October 2020, interest payable semi-annually at 3.625% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage | 3.625% |  |  |  |  |  |  |  |  |  |  |  |
Amount redeemed | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due October 2025, interest payable semi-annually at 5.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Amount redeemed | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due October 2022, interest payable semi-annually at 4.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage | 4.50% |  |  |  |  |  |  |  |  |  |  |  |
Amount redeemed | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2024, interest payable semi-annually at 3.875% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes amount | € |  |  |  |  |  |  |  |  | € 500,000,000 |  |  |  |
Debt instrument, stated percentage | 3.875% |  |  |  |  |  |  |  |  |  |  |  |
Amount redeemed | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2023, interest payable semi-annually at 3.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage | 3.50% |  |  |  |  |  |  |  |  |  |  |  |
Amount redeemed | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
FIS Credit Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total committed capital, credit agreement |  |  |  |  | 3,000,000,000 |  |  |  |  |  |  |  |
Write off of capitalized debt issuance costs |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility outstanding amount |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due 2021, interest payable semi-annually at 2.250% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 1 month |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due 2026, interest payable semi-annually at 3.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 3 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due 2046, interest payable semi-annually at 4.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due March 2022, interest payable semi-annually at 5.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 2 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Euro Notes due 2021, interest payable annually at 0.400% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 1 month |  |  |  |  |  |  |  |
Minimum [Member] | Senior GBP Notes due 2022, interest payable annually at 1.700% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 1 month |  |  |  |  |  |  |  |
Minimum [Member] | Senior Euro Notes due 2024, interest payable annually at 1.100% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 3 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due October 2020, interest payable semi-annually at 3.625% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 1 month |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due October 2025, interest payable semi-annually at 5.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 3 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due October 2022, interest payable semi-annually at 4.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 2 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due 2024, interest payable semi-annually at 3.875% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 3 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due 2023, interest payable semi-annually at 3.500% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 3 months |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due April 2018, interest payable semi-annually at 2.000% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 1 month |  |  |  |  |  |  |  |
Minimum [Member] | Senior Notes due October 2018, interest payable semi-annually at 2.850% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Make whole amount, trigger period prior to maturity |  |  |  |  | 1 month |  |  |  |  |  |  |  |

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- Definition Capital Commitment Under Credit Agreement + References No definition available. + Details
Name: | fis_CapitalCommitmentUnderCreditAgreement
Namespace Prefix: | fis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument, Make Whole Amount, Trigger, Period Prior to Maturity + References No definition available. + Details
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Namespace Prefix: | fis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Repurchase Amount of Premium + References No definition available. + Details
Name: | fis_DebtInstrumentRepurchaseAmountofPremium
Namespace Prefix: | fis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair Value, Aggregate Differences, Long-term Debt Instruments + References No definition available. + Details
Name: | fis_FairValueAggregateDifferencesLongtermDebtInstruments
Namespace Prefix: | fis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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