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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Dec. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 70,000,000 |  |  |  | $ 70,000,000 |  | $ 86,000,000
Accumulated impairment loss | 0 |  |  |  | 0 |  |
Equity securities without a readily determinable fair value | 157,000,000 |  |  |  | 157,000,000 |  | 156,000,000
Foreign currency translation loss | 18,000,000 |  | $ 32,000,000 |  | 53,000,000 | $ 50,000,000 |
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 |  |  |  | $ 140,000,000 |  |  |
Merchants Utilizing Clover Capital Cash Advance Program |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash advances | 303,000,000 |  |  |  | 303,000,000 |  | 281,000,000
Allowance for credit loss, current | 12,000,000 |  |  |  | 12,000,000 |  | 12,000,000
Merchant credit losses |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate merchant credit loss expense | 28,000,000 |  | $ 22,000,000 |  | 53,000,000 | $ 37,000,000 |
Collateral held | 640,000,000 |  |  |  | 640,000,000 |  | 690,000,000
Loss contingency accrual | $ 38,000,000 |  |  |  | $ 38,000,000 |  | $ 36,000,000

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