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, 2020	Mar. 31, 2019
Loss Contingency Accrual
Beginning balance	$ 399	$ 344
Provisions, net of recoveries	247	286
Realized losses	(270)	(261)
Recoveries	20	16
Ending balance	$ 396	$ 385

Loss Contingency, Recovery From Third Party

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

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