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Reserves for Losses (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes in the Card Member loans reserve for losses
Balance, January 1			$ 1,201	$ 1,261
Provisions	$ 285	$ 282	520	532
Cardmember loans net write-offs - principal			(502)	(541)
Cardmember loans net write-offs - interest and fees			(85)	(84)
Card Member loans reserves for losses - other			(2)	(2)
Balance, June 30	$ 1,132	$ 1,170	$ 1,132	$ 1,170

X

- Definition

Reflects the interest and fees amount of loans that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities for the period. This represents a Debit to Provision instead of a Debit to P&L.

+ References

No definition available.

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X

- Definition

Represents adjustments to cardmember loans reserve including foreign currency translation adjustments and net write-offs related to unauthorized transactions for the period. This represents a Debit to Provision instead of a Debit to P&L.

+ References

No definition available.

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- Definition

Reflects the principal amount of loans that have been removed, or charged off, from both loan receivables and the reserve for credit losses, net of recoveries, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities for the period. This represents a Debit to Provision instead of a Debit to P&L.

+ References

No definition available.

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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.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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