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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2025 USD ($) | Jun. 30, 2026 USD ($) noncontrolling_interest | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) noncontrolling_interest | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) reporting_unit
Business Combination [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ 86,000,000 |  |  | $ 86,000,000 |  | $ 84,000,000
Proceeds from repayments and sales of merchant cash advances, originally classified as held for sale |  |  |  |  | 152,000,000 |  |
Proceeds from sale of property, plant, and equipment |  |  |  |  | 201,000,000 |  |
Gain (loss) on disposition of property plant equipment |  |  |  |  | 83,000,000 |  |
Goodwill, impairment loss | $ 0 |  |  |  |  |  | $ 0
Reporting unit, percentage of fair value in excess of carrying amount |  |  |  |  |  |  | 15.00%
Number of reporting units | reporting_unit |  |  |  |  |  |  | 8
Reporting unit, fair value in excess of carrying amount, allocated amount of goodwill |  |  |  |  |  |  | $ 18,500,000,000
Goodwill, accumulated impairment loss |  | 0 |  |  | 0 |  |
Foreign currency translation gain (loss) |  | $ (30,000,000) |  | $ (46,000,000) | $ (9,000,000) | $ (64,000,000) |
Change in estimated redemption value of redeemable noncontrolling interest (see Note 11) |  |  | $ 89,000,000 |  |  |  |
Minimum |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Merchant cash advances, collection period |  |  |  |  | 6 months |  |
Maximum |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Merchant cash advances, collection period |  |  |  |  | 12 months |  |
First Data Joint Venture |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Ownership percentage by noncontrolling owner |  | 1.00% |  |  | 1.00% |  |
First Data |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Number of redeemable noncontrolling interests | noncontrolling_interest |  | 1 |  |  | 1 |  |
Merchants Utilizing Clover Capital Cash Advance Program |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Cash advances |  | $ 454,000,000 |  |  | $ 454,000,000 |  | 598,000,000
Allowance for credit loss, current |  | 29,000,000 |  |  | 29,000,000 |  | 34,000,000
Foreign Merchants |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Cash advances |  | 1,007,000,000 |  |  | $ 1,007,000,000 |  | 1,223,000,000
Settlement anticipation cash advances, collection period |  |  |  |  | 30 days |  |
Merchant credit losses |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Collateral held |  | 518,000,000 |  |  | $ 518,000,000 |  | 588,000,000
Aggregate merchant credit loss expense |  | 32,000,000 |  | $ 33,000,000 | 66,000,000 | $ 61,000,000 |
Loss contingency accrual |  | $ 50,000,000 |  |  | $ 50,000,000 |  | $ 46,000,000

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