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Commitments and Contingencies - Estimate of the Maximum Potential Exposure and Allowance for Transaction Losses Related to Protection Products (Details) - Protection Programs - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Loss Contingency Accrual    
Beginning balance $ 414 $ 399
Provisions, net of recoveries 281 247
Realized losses (347) (270)
Recoveries 20 20
Ending balance $ 368 $ 396