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Summary of Significant Accounting Policies - Allowance for Merchant Credit Losses (Details) - Merchant credit losses - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Loss Contingencies [Line Items] |  |  |
Aggregate merchant credit losses incurred | $ 108 | $ 80 | $ 62
Collateral held | 598 | 690 |
Loss contingency accrual | $ 40 | $ 36 |

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