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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |
Restricted cash and cash equivalents | $ 13,000,000 |  | $ 13,000,000
Allowance for doubtful accounts | 50,000,000 |  | 48,000,000
Accumulated impairment loss | 0 |  |
Equity securities without a readily determinable fair value | 117,000,000 |  | 160,000,000
Ondot |  |  |
Business Acquisition [Line Items] |  |  |
Pre-tax gain from remeasurement | 12,000,000 |  |
Merchant credit losses |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate merchant credit losses incurred | 22,000,000 | $ 30,000,000 |
Collateral held | 1,900,000,000 |  | 1,200,000,000
Loss contingency accrual | $ 60,000,000 |  | $ 59,000,000

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