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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | $ 3,820 | $ 3,431 |
Revenue from other sources | 1,433 | 1,770 |
Non-interest income | 5,253 | 5,201 | $ 4,777
Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3,045 | 2,617 |
Revenue from other sources | 843 | 903 |
Non-interest income | 3,888 | 3,520 | 3,325
Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 604 | 661 |
Revenue from other sources | 39 | 2 |
Non-interest income | 643 | 663 | 749
Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 178 | 158 |
Revenue from other sources | 653 | 586 |
Non-interest income | 831 | 744 | 708
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (7) | (5) |
Revenue from other sources | (102) | 279 |
Non-interest income | (109) | 274 | $ (5)
Interchange fees, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3,179 | 2,823 |
Customer reward expenses | 4,900 | 4,400 |
Interchange fees, net | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 2,925 | 2,609 |
Interchange fees, net | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 205 | 185 |
Interchange fees, net | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 55 | 33 |
Interchange fees, net | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (6) | (4) |
Service changes and other customer-related fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 417 | 489 |
Service changes and other customer-related fees | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 0 | 0 |
Service changes and other customer-related fees | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 298 | 367 |
Service changes and other customer-related fees | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 120 | 123 |
Service changes and other customer-related fees | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (1) | (1) |
Other contract revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 224 | 119 |
Other contract revenue | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 120 | 8 |
Other contract revenue | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 101 | 109 |
Other contract revenue | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3 | 2 |
Other contract revenue | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | $ 0 | $ 0 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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