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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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