Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 744	$ 599
Settlement assets	624	515
Other receivables	203	432
Prepaid expenses and other current assets	1,290	959
Total current assets	5,274	4,488
Property and equipment, net	1,140	691
Goodwill	25,026	17,762
Intangible assets, net	4,314	959
Software, net	5,238	2,876
Equity method investment	13	3,681
Other noncurrent assets	1,819	1,710
Deferred contract costs, net	1,282	1,321
Total assets	44,106	33,488
Current liabilities:
Accounts payable, accrued and other liabilities	2,429	2,097
Settlement payables	687	549
Deferred revenue	1,007	957
Short-term borrowings	4,226	2,729
Current portion of long-term debt	1,516	1,284
Total current liabilities	9,865	7,616
Long-term debt, excluding current portion	15,432	9,069
Deferred income taxes	883	1,215
Other noncurrent liabilities	1,885	1,686
Total liabilities	28,065	19,586
FIS stockholders' equity:
Preferred stock $0.01 par value; 200 shares authorized, none issued and outstanding as of June 30, 2026, and December 31, 2025	0	0
Common stock $0.01 par value, 750 shares authorized, 640 and 636 shares issued as of June 30, 2026, and December 31, 2025, respectively	6	6
Additional paid in capital	47,501	47,317
(Accumulated deficit) retained earnings	(20,578)	(22,718)
Accumulated other comprehensive earnings (loss)	(587)	(504)
Treasury stock, $0.01 par value, 124 and 122 common shares as of June 30, 2026, and December 31, 2025, respectively, at cost	(10,304)	(10,202)
Total FIS stockholders' equity	16,038	13,899
Noncontrolling interest	3	3
Total equity	16,041	13,902
Total liabilities and equity	44,106	33,488
Nonrelated Party
Current assets:
Trade receivables, net of allowance for credit losses and receivable from related party	2,413	1,944
Related Party
Current assets:
Trade receivables, net of allowance for credit losses and receivable from related party	$ 0	$ 39

Capitalized Cost, Software For Internal And External Use, After Accumulated Amortization

No definition available.

Name:	fis_CapitalizedCostSoftwareForInternalAndExternalUseAfterAccumulatedAmortization
Namespace Prefix:	fis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.