Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

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Area code of city

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End date of current fiscal year in the format --MM-DD.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fiscal period values are FY, Q1, Q2, and Q3. 1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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No definition available.

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Boolean flag that is true only for a form used as a transition report.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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No definition available.

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Documents incorporated by reference.

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Address Line 1 such as Attn, Building Name, Street Name

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No definition available.

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Name of the City or Town

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Code for the postal or zip code

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Name of the state or province.

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.

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Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.

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Indicate if registrant meets the emerging growth company criteria.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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No definition available.

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Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.

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Two-character EDGAR code representing the state or country of incorporation.

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Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

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The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.

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No definition available.

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The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.

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Indicates that the company is a Smaller Reporting Company (SRC).

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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

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No definition available.

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Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.

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No definition available.

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Local phone number for entity.

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No definition available.

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Title of a 12(b) registered security.

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Name of the Exchange on which a security is registered.

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Trading symbol of an instrument as listed on an exchange.

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Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2019	Feb. 19, 2020	Jun. 30, 2019
Cover
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-16427
Entity Registrant Name	Fidelity National Information Services, Inc.
Entity Incorporation, State or Country Code	2Q
Entity Tax Identification Number	37-1490331
Entity Address, Street Address	601 Riverside Avenue
Entity Address, City	Jacksonville
Entity Address, State	FL
Entity Address, Zip Code	32204
City Area Code	904
Local Phone Number	438-6000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 39,616,487,459
Entity Common Stock, Shares Outstanding		616,321,624
Documents Incorporated by Reference	The information in Part III hereof is incorporated herein by reference to the registrant’s Proxy Statement on Schedule 14A for the fiscal year ended December 31, 2019, to be filed within 120 days after the close of the fiscal year that is the subject of this Report.
Entity Central Index Key	0001136893
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Common shares \| New York Stock Exchange
Cover
Title of Each Class:	Common Stock, par value $0.01 per share
Trading Symbol(s)	FIS
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Notes due January 2021, interest payable annually at 0.400% (2021 Euro Notes) \| New York Stock Exchange
Cover
Title of Each Class:	0.400% Senior Notes due 2021
Trading Symbol(s)	FIS21A
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Floating Rate Notes due May 2021, interest payable quarterly (Floating Rate Notes) \| New York Stock Exchange
Cover
Title of Each Class:	Floating Rate Senior Notes due 2021
Trading Symbol(s)	FIS21B
Name of Each Exchange on Which Registered:	NYSE
Point One Two Five Percent Euro Senior Notes Due December 2021 \| New York Stock Exchange
Cover
Title of Each Class:	0.125% Senior Notes due 2021
Trading Symbol(s)	FIS21C
Name of Each Exchange on Which Registered:	NYSE
Senior GBP Notes due June 2022, interest payable annually at 1.700% (2022 GBP Notes) \| New York Stock Exchange
Cover
Title of Each Class:	1.700% Senior Notes due 2022
Trading Symbol(s)	FIS22B
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Notes due May 2021, interest payable annually at 0.125% (May 2021 Euro Notes) \| New York Stock Exchange
Cover
Title of Each Class:	0.125% Senior Notes due 2022
Trading Symbol(s)	FIS22C
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Notes due May 2023, interest payable annually at 0.750% (2023 Euro Notes) \| New York Stock Exchange
Cover
Title of Each Class:	0.750% Senior Notes due 2023
Trading Symbol(s)	FIS23A
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Notes due July 2024, interest payable annually at 1.100% (2024 Euro Notes) \| New York Stock Exchange
Cover
Title of Each Class:	1.100% Senior Notes due 2024
Trading Symbol(s)	FIS24A
Name of Each Exchange on Which Registered:	NYSE
Senior GBP Notes due May 2025, interest payable annually at 2.602% (2025 GBP Notes) \| New York Stock Exchange
Cover
Title of Each Class:	2.602% Senior Notes due 2025
Trading Symbol(s)	FIS25A
Name of Each Exchange on Which Registered:	NYSE
0.625% Euro Senior Notes due December 2025 \| New York Stock Exchange
Cover
Title of Each Class:	0.625% Senior Notes due 2025
Trading Symbol(s)	FIS25B
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Notes due May 2027, interest payable annually at 1.500% (2027 Euro Notes) \| New York Stock Exchange
Cover
Title of Each Class:	1.500% Senior Notes due 2027
Trading Symbol(s)	FIS27
Name of Each Exchange on Which Registered:	NYSE
1.000% Euro Senior Notes due December 2028 \| New York Stock Exchange
Cover
Title of Each Class:	1.000% Senior Notes due 2028
Trading Symbol(s)	FIS28
Name of Each Exchange on Which Registered:	NYSE
2.250% Sterling Senior Notes due December 2029 \| New York Stock Exchange
Cover
Title of Each Class:	2.250% Senior Notes due 2029
Trading Symbol(s)	FIS29
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Notes due May 2030, interest payable annually at 2.000% (2030 Euro Notes) \| New York Stock Exchange
Cover
Title of Each Class:	2.000% Senior Notes due 2030
Trading Symbol(s)	FIS30
Name of Each Exchange on Which Registered:	NYSE
Senior GBP Notes due May 2031, interest payable annually at 3.360% (2031 GBP Notes) \| New York Stock Exchange
Cover
Title of Each Class:	3.360% Senior Notes due 2031
Trading Symbol(s)	FIS31
Name of Each Exchange on Which Registered:	NYSE
Senior Euro Notes due May 2039, interest payable annually at 2.950% (2039 Euro Notes) \| New York Stock Exchange
Cover
Title of Each Class:	2.950% Senior Notes due 2039
Trading Symbol(s)	FIS39
Name of Each Exchange on Which Registered:	NYSE