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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts |  |  | $ 72,000,000 |  | $ 72,000,000 |  | $ 86,000,000
Accumulated impairment loss |  |  | 0 |  | 0 |  |
Equity securities without a readily determinable fair value |  |  | 137,000,000 |  | 137,000,000 |  | 156,000,000
Foreign currency translation loss |  |  | 22,000,000 | $ 38,000,000 | 75,000,000 | $ 88,000,000 |
Defined benefit plan, actuarial 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 |  | $ 20,000,000 |  |  |  |  |
Pension and other postretirement benefits expense (reversal of expense), noncash |  | $ 140,000,000 |  |  |  |  |
Merchants Utilizing Clover Capital Cash Advance Program |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash advances |  |  | 326,000,000 |  | 326,000,000 |  | 281,000,000
Allowance for credit loss, current |  |  | 13,000,000 |  | 13,000,000 |  | 12,000,000
Merchant credit losses |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate merchant credit loss expense |  |  | 24,000,000 | $ 25,000,000 | 77,000,000 | $ 62,000,000 |
Collateral held |  |  | 666,000,000 |  | 666,000,000 |  | 690,000,000
Loss contingency accrual |  |  | $ 38,000,000 |  | $ 38,000,000 |  | $ 36,000,000

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