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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
segment
payment_installment
payment_processor
Dec. 31, 2024
USD ($)
payment_processor
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Concentration Risk [Line Items]        
Number of reportable segments | segment 2      
Interest earned on customer funds $ 192,100,000 $ 185,200,000 $ 142,200,000  
Severance and other related expenses 78,600,000 26,800,000 104,000,000.0  
Advertising costs 478,400,000 338,100,000 360,100,000  
Selling and marketing expenses not directly related to a revenue generating transaction 889,900,000 898,300,000 904,000,000.0  
Interest income 127,100,000 156,200,000 126,600,000  
Interest expense 256,400,000 165,500,000 0  
Restricted cash 1,071,574,000 902,478,000 770,380,000  
Restricted cash 73,786,000 69,915,000 71,812,000  
Reclassification from loans held for sale to loans held for investment 1,100,000,000      
Net gains on sales of loans 255,800,000 236,800,000 196,100,000  
Consumer receivables reclassified from loans held for investment to loans held for sale and sold to third parties 840,000,000.0      
Increase in retained earnings 22,169,882,000 21,234,962,000 18,692,836,000 $ 17,251,355,000
Bitcoin for investment purposes, cost 41,133,000 31,466,000    
Gain (loss) from the remeasurement of bitcoin investment $ (55,900,000) 420,918,000 207,084,000  
Measurement period for business combinations 1 year      
Intangible assets impairment $ 0 0 0  
Settlement period for customers payable 1 day      
Retained earnings (accumulated deficit)        
Concentration Risk [Line Items]        
Increase in retained earnings $ 3,674,254,000 2,368,618,000 $ (528,429,000) (568,712,000)
Cumulative Effect, Period of Adoption, Adjustment        
Concentration Risk [Line Items]        
Bitcoin for investment purposes, fair value       30,500,000
Increase in retained earnings       30,511,000
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings (accumulated deficit)        
Concentration Risk [Line Items]        
Increase in retained earnings       $ 30,511,000
Consumer        
Concentration Risk [Line Items]        
Threshold period past due to consider amounts to be uncollectible 180 days      
Restricted Stock Awards (RSAs) and Restricted Stock Units (RSUs)        
Concentration Risk [Line Items]        
Vesting term 4 years      
Commerce Enablement | Afterpay Limited | Customer Payment Term 1        
Concentration Risk [Line Items]        
Payment period 3 months      
Commerce Enablement | Afterpay Limited | Customer Payment Term 2        
Concentration Risk [Line Items]        
Payment period 6 months      
Commerce Enablement | Afterpay Limited | Customer Payment Term 3        
Concentration Risk [Line Items]        
Payment period 12 months      
Commerce Enablement | Afterpay Limited | Customer Payment Term 4        
Concentration Risk [Line Items]        
Payment period 24 months      
Bitcoin ecosystem revenue        
Concentration Risk [Line Items]        
Contract with customer, term 1 month      
Variable Interest Entity, Primary Beneficiary        
Concentration Risk [Line Items]        
Restricted Cash: $ 426,900,000 $ 402,900,000    
Minimum        
Concentration Risk [Line Items]        
Settlements receivable, settlement period 1 day      
Settlements receivable and payable, settlement period 1 day      
Minimum | Commerce Enablement | Afterpay Limited        
Concentration Risk [Line Items]        
Number of payment installments | payment_installment 3      
Minimum | Bitcoin ecosystem revenue        
Concentration Risk [Line Items]        
Payment period 30 days      
Maximum        
Concentration Risk [Line Items]        
Settlements receivable, settlement period 2 days      
Loans held for sale selling period 2 days      
Settlements receivable and payable, settlement period 2 days      
Maximum | Commerce Enablement | Afterpay Limited        
Concentration Risk [Line Items]        
Number of payment installments | payment_installment 4      
Maximum | Bitcoin ecosystem revenue        
Concentration Risk [Line Items]        
Payment period 90 days      
Settlements Receivable | Credit Concentration Risk        
Concentration Risk [Line Items]        
Number of third party processors | payment_processor 4 3    
Settlements Receivable | Credit Concentration Risk | Third Party Processor One        
Concentration Risk [Line Items]        
Concentration risk (as a percent) 36.00% 42.00%    
Settlements Receivable | Credit Concentration Risk | Third Party Processor Two        
Concentration Risk [Line Items]        
Concentration risk (as a percent) 25.00% 17.00%    
Settlements Receivable | Credit Concentration Risk | Third Party Processor Three        
Concentration Risk [Line Items]        
Concentration risk (as a percent) 11.00% 13.00%    
Settlements Receivable | Credit Concentration Risk | Third Party Processor Four        
Concentration Risk [Line Items]        
Concentration risk (as a percent) 10.00%