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Acquisitions and Divestitures Textual ( Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016
Business Events Textuals [Abstract] |  |  |  |
Gain on sale of HFS Portfolios |  |  |  | $ (1,218)
Other Expense [Member] | Goodwill Impairment Charges [Domain] |  |  |  |
Business Events Textuals [Abstract] |  |  |  |
Goodwill And Intangible Asset Impairment |  |  | $ 384 |
Other Expense [Member] |  |  |  |
Business Events Textuals [Abstract] |  |  |  |
Goodwill And Intangible Asset Impairment |  |  | 219 |
Other Expense [Member] | Write-down of technology and other assets to fair value [Member] |  |  |  |
Business Events Textuals [Abstract] |  |  |  |
Goodwill And Intangible Asset Impairment |  |  | $ 165 |
Costco [Member] | Other Expense [Member] |  |  |  |
Business Events Textuals [Abstract] |  |  |  |
Gain on sale of HFS Portfolios | $ (1,091) |  |  |
JetBlue [Member] | Other Expense [Member] |  |  |  |
Business Events Textuals [Abstract] |  |  |  |
Gain on sale of HFS Portfolios |  | $ (127) |  |

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- Definition Acquisition and discontinued operation. + References No definition available. + Details
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- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
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- Definition The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3337-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82926135&loc=d3e60097-112785 + Details
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