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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