| Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income (loss) | -114 | -255 | -365 | -462 | -287 | -2,894 | 150 | 404 |
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| Depreciation and amortization expense | - | - | - | - | - | - | 352 | 305 |
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| Goodwill impairment | - | - | - | - | - | 847 | - | - |
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| Equity-based compensation expense | 6 | 24 | 33 | 25 | 39 | 69 | 73 | 91 |
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| Loss on disposal of property and equipment | -1 | -1 | -2 | -6 | -1 | -14 | -8 | -12 |
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| Loss (Gain) on debt extinguishment | - | - | - | -34 | - | - | 878 | -12 |
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| Paid-in-Kind Interest | - | - | - | - | - | - | 184 | 458 |
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| Provision for bad debt and valuation allowance | 1 | 2 | 12 | 21 | 28 | 23 | 38 | 27 |
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| Amortization of debt issuance costs | 2 | 2 | - | - | - | - | - | 15 |
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| Fair Value Adjustment of Warrants | - | - | - | - | 24 | 80 | -3 | -115 |
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| Unrealized gain on beneficial interests in securitizations | - | - | -1 | 9 | 7 | 6 | 14 | 23 |
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| Originations of finance receivables | 529 | 1,260 | 2,625 | 3,579 | 7,306 | 7,214 | 6,041 | 8,329 |
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| Proceeds from Sale, Loan, Held-for-Sale | - | - | 2,644 | 3,635 | 7,391 | 6,297 | 6,594 | 8,805 |
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| Gain on loan sales | 22 | 52 | 137 | 218 | 717 | 411 | 434 | 755 |
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| Proceeds from Collection, Loan, Held-for-Sale | - | - | 85 | 90 | 206 | 190 | 186 | 188 |
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| Vehicle inventory | 41 | 183 | 345 | 263 | 2,086 | -1,354 | -711 | 455 |
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| Accounts receivable | 9 | 19 | 10 | 43 | 148 | -145 | 22 | 47 |
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| Other assets | 1 | 5 | 33 | 26 | 105 | 83 | -39 | -15 |
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| Accounts payable and accrued liabilities | 17 | 66 | 98 | 94 | 247 | -46 | -166 | 260 |
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| Operating lease right-of-use assets | - | - | - | - | - | - | -81 | -15 |
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| Operating lease liabilities | - | - | - | - | - | - | -71 | -10 |
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| Other liabilities | 7 | -1 | -0 | -0 | - | -13 | -8 | 45 |
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| Net cash provided by (used in) operating activities | -200 | -414 | -757 | -608 | -2,594 | -1,324 | 803 | 918 |
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| Purchases of property and equipment | 78 | 144 | 231 | 360 | 557 | 512 | 87 | 91 |
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| Proceeds from disposal of property and equipment | - | - | - | - | - | 44 | 72 | 11 |
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| Payments for acquisitions, net of cash acquired | - | - | - | - | - | - | 7 | - |
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| Principal payments received on and proceeds from sale of beneficial interests | - | - | - | - | 56 | 81 | 53 | 67 |
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| Net cash (used in) provided by investing activities | -83 | -150 | -228 | -346 | -627 | -2,583 | 31 | -13 |
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| Proceeds from Lines of Credit | 949 | 1,848 | 4,486 | 4,429 | 14,600 | 12,982 | 6,709 | 3,096 |
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| Payments on short-term revolving facilities | 866 | 1,900 | 4,219 | 4,958 | 12,587 | 13,501 | 7,575 | 3,697 |
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| Proceeds from issuance of long-term debt | - | - | 482 | 1,336 | 1,650 | 3,435 | 132 | 191 |
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| Payments on long-term debt | - | - | 16 | 654 | 73 | 165 | 503 | 577 |
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| Payments of debt issuance costs | 2 | 11 | 11 | 29 | 24 | 75 | 69 | 4 |
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| Net proceeds from issuance of Class A common stock and LLC Units | - | - | 298 | 1,059 | - | 1,227 | 453 | 1,264 |
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| Proceeds from equity-based compensation plans | - | - | - | - | 2 | 4 | - | 7 |
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| Tax withholdings related to restricted stock units and awards | 1 | 3 | 6 | 23 | 40 | 8 | 15 | 19 |
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| Net cash provided by (used in) financing activities | 416 | 466 | 1,015 | 1,165 | 3,528 | 3,899 | -868 | 261 |
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| Net increase (decrease) in cash, cash equivalents and restricted cash | - | -98 | 30 | 211 | 307 | -8 | -34 | 1,166 |
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