Fair Value (Details 1) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Financial Assets Textuals [Abstract]
Card Member receivables HFS	$ 0	$ 24
Financial assets carried at other than fair value [Abstract]
Card Member loans, less reserves	424	431
Loans to affiliates and other	12,509	14,262
Financial liabilities carried at other than fair value [Abstract]
Long-term Debt	23,277	21,725
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financial Assets:
Financial assets for which carrying values equal or approximate fair value	18,400	18,400
Financial Assets Textuals [Abstract]
Card Member receivables HFS	0	24
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	6,100	9,400
Level 2 [Member]
Financial Assets:
Financial assets for which carrying values equal or approximate fair value	18,200	18,200
Financial Assets Textuals [Abstract]
Card Member receivables HFS	0	24
Financial assets carried at other than fair value [Abstract]
Card Member loans, less reserves	0	0
Loans to affiliates and other	9,700	11,300
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	6,100	9,400
Financial liabilities carried at other than fair value [Abstract]
Long-term Debt	23,300	21,800
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Financial assets for which carrying values equal or approximate fair value	0	0
Financial assets carried at other than fair value [Abstract]
Card Member loans, less reserves	400	400
Loans to affiliates and other	2,800	3,000
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	0	0
Financial liabilities carried at other than fair value [Abstract]
Long-term Debt	0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Assets:
Financial assets for which carrying values equal or approximate fair value	18,400	18,400
Financial Assets Textuals [Abstract]
Card Member receivables HFS	0	24
Financial assets carried at other than fair value [Abstract]
Card Member loans, less reserves	400	400
Loans to affiliates and other	12,500	14,300
Financial Liabilities:
Financial liabilities for which carrying values equal or approximate fair value	6,100	9,400
Financial liabilities carried at other than fair value [Abstract]
Long-term Debt	23,300	21,800
FairValueInputsLevel1Member
Financial Assets:
Financial assets for which carrying values equal or approximate fair value	$ 200	$ 200

Assets Carried At Other Than Fair Value [Abstract]

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Financial assets for which carrying values equal or approximate fair value include cash and cash equivalents, cardmember receivables, due from affiliates, accrued interest, and certain other assets. For these assets, the carrying values approximate fair value because they are short-term in duration, have no defined maturity or have a market-based interest rate.

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Financial liabilities for which carrying values equal or approximate fair value include short-term debt, short-term debt to affiliates, accrued interest, and certain other liabilities for which the carrying values approximate fair value because they are short-term in duration, have no defined maturity or have a market-based interest rate.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Name Accounting Standards Codification
-Topic 210
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-Name Regulation S-X (SX)
-Number 210
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-Paragraph 20, 22
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The face amount of all receivables that will be sold to other entities, including trade and loan receivables.

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