Loans and Accounts Receivable (Details 5) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	$ 1,098	$ 853	$ 1,056	$ 846
Interest income recognized	32	24	63	48
Global Consumer Services Group [Member] \| Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	846	674	819	671
Interest income recognized	26	20	52	40
Global Consumer Services Group [Member] \| Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	31	18	29	18
Interest income recognized	0	0	0	0
Global Commercial Services [Member] \| Card Member Loans [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	149	120	141	117
Interest income recognized	6	4	11	8
Global Commercial Services [Member] \| Card Member Receivables [Member]
Financing Receivable Impaired [Line Items]
Average balance of impaired loans	72	41	67	40
Interest income recognized	$ 0	$ 0	$ 0	$ 0

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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