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Non-Interest Revenue and Expense Detail (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Details Of Certain Statements Of Income Lines Details [Abstract]
Foreign currency conversion fee revenue	$ 196	$ 211
Delinquency fees	200	195
Loyalty Partner-related fees	94	91
Travel commissions and fees	80	89
Service fees	78	87
Other	32	35
Total Other fees and commissions	$ 680	$ 708

X

- Definition

Represents amounts to cardmembers for failure to pay the outstanding (or minimum balance) on their cards by the due date.

+ References

No definition available.

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- Definition

Details of Certain Statements of Income Lines Details.

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- Definition

Primary financial statement caption in which reported facts about foreign currency gain (loss) have been included.

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- Definition

Represents fees generated by the Loyalty Partner business.

+ References

No definition available.

+ Details

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- Definition

Represents revenues from miscellaneous items within other commissions and fees not previously classified.

+ References

No definition available.

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- Definition

Fee for services rendered usually based on a percentage of an amount received or collected or agreed to be paid for professional services.

+ References

No definition available.

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- Definition

Commissions and fees earned by charging clients transaction or management fees for selling and arranging travel and travel management services. Client transaction fee revenue is recognized at the time the client books the travel arrangements. Travel management services revenue is recognized over the contractual term of the agreement. The Company's travel suppliers (for example, airlines, hotels, car rental companies) pay commissions and fees on tickets issued, sales and other services based on contractual agreements. Commissions and fees from travel suppliers are generally recognized at the time a ticket is purchased or over the term of the contract. Commissions and fees that are based on actual usage that is unknown at time of purchase (for example, hotel and car rentals), are recognized when cash is received.

+ References

No definition available.

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- Definition

Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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