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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |
Allowance for doubtful accounts | $ 69,000,000 |  |  | $ 86,000,000
Prepaid expenses | 543,000,000 |  |  | 423,000,000
Other current assets | 2,052,000,000 |  |  | 1,921,000,000
Income taxes receivable, current | 568,000,000 |  |  | 534,000,000
Accumulated impairment loss | 0 |  |  |
Equity securities without a readily determinable fair value | 174,000,000 |  |  | 156,000,000
Foreign currency translation loss | 35,000,000 | $ 18,000,000 |  |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit | (63,000,000) |  |  |
Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Defined benefit plan, cost of providing special and contractual termination benefits |  |  | $ 25,000,000 |
Pension and other postretirement benefits expense (reversal of expense), noncash |  |  | $ 150,000,000 |
Merchants Utilizing Clover Capital Cash Advance Program |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Receivable, before allowance for credit loss, current | 297,000,000 |  |  | 281,000,000
Allowance for credit loss, current | 13,000,000 |  |  | 12,000,000
Foreign Banks and Alliance Partners |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Receivable, before allowance for credit loss, current | 520,000,000 |  |  | 381,000,000
Merchant credit losses |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate merchant credit loss expense | 25,000,000 | $ 15,000,000 |  |
Collateral held | 692,000,000 |  |  | 690,000,000
Loss contingency accrual | $ 34,000,000 |  |  | $ 36,000,000

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