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	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loss Contingency Accrual
Beginning balance	$ 385	$ 283	$ 344	$ 266
Provisions, net of recoveries	247	262	533	505
Realized losses	(237)	(241)	(482)	(467)
Ending balance	$ 395	$ 304	$ 395	$ 304

Amount of loss contingency liability.

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.

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

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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.

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