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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2024 USD ($) segment payment_installment payment_processor | Dec. 31, 2023 USD ($) payment_processor | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Concentration Risk [Line Items] |  |  |  |
Number of reportable segments | segment | 2 |  |  |
Interest earned on customer funds | $ 185,200,000 | $ 142,200,000 | $ 0 |
Severance and other related expenses | 26,800,000 | 104,000,000 |  |
Advertising costs | 338,100,000 | 360,100,000 | 544,200,000 |
Selling and marketing expenses not directly related to a revenue generating transaction | 889,900,000 | 898,300,000 | 840,000,000 |
Interest income | 156,200,000 | 126,600,000 | 0 |
Interest expense | 165,500,000 | 0 | 0 |
Short-term restricted cash | 902,478,000 | 770,380,000 | 639,780,000 |
Long-term restricted cash | 69,915,000 | 71,812,000 | 71,600,000 |
Reclassification from loans held for sale to loans held for investment | 903,800,000 |  |  |
Net gains on sales of loans | 236,800,000 | 196,100,000 | 164,300,000 |
Consumer receivables reclassified from loans held for investment to loans held for sale and sold to third parties | 438,600,000 |  |  |
Bitcoin for investment purposes, fair value | 792,282,000 | 339,898,000 |  |
Increase in retained earnings | 21,234,962,000 | 18,692,836,000 | 17,251,355,000 | $ 3,313,589,000
Bitcoin for investment purposes, cost | 31,466,000 |  |  |
Gain from the remeasurement of bitcoin investment | $ 420,918,000 | 207,084,000 | 0 |
Measurement period for business combinations | 1 year |  |  |
Intangible assets impairment | $ 0 | 0 | 0 |
Settlement period for customers payable | 1 day |  |  |
Reversal of safeguarding liabilities and corresponding asset |  | 1,000,000,000 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Restricted cash | $ 402,900,000 | 406,600,000 |  |
Retained Earnings |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Increase in retained earnings | $ 2,368,618,000 | $ (528,429,000) | (568,712,000) | $ (27,965,000)
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 |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Increase in retained earnings |  |  | $ 30,511,000 |
Restricted Stock Awards (RSAs) and Restricted Stock Units (RSUs) |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Vesting term | 4 years |  |  |
Consumer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Threshold period past due to consider amounts to be uncollectible | 180 days |  |  |
Credit Concentration Risk | Settlements Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of third party processors | payment_processor | 3 | 2 |  |
Third Party Processor One | Credit Concentration Risk | Settlements Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk | 42.00% | 46.00% |  |
Third Party Processor Two | Credit Concentration Risk | Settlements Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk | 17.00% | 35.00% |  |
Third Party Processor Three | Credit Concentration Risk | Settlements Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk | 13.00% |  |  |
Minimum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Settlements receivable, settlement period | 1 day |  |  |
Loans held for sale selling period | 1 day |  |  |
Settlements receivable and payable, settlement period | 1 day |  |  |
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 |  |  |
Subscription and services-based revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Contract with customer, term | 1 month |  |  |
Subscription and services-based revenue | Afterpay Limited |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Increment payment period | 14 days |  |  |
Subscription and services-based revenue | Minimum | Afterpay Limited |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of payment installments | payment_installment | 3 |  |  |
Payment period | 6 months |  |  |
Subscription and services-based revenue | Maximum | Afterpay Limited |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of payment installments | payment_installment | 4 |  |  |
Payment period | 12 months |  |  |
Hardware revenue | Minimum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Payment period | 30 days |  |  |
Hardware revenue | Maximum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Payment period | 90 days |  |  |

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