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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | $ 3,737 | $ 3,820 | $ 3,431
Revenue from other sources | 1,873 | 1,433 | 1,770
Non-interest income (loss) | 5,610 | 5,253 | 5,201
Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3,062 | 3,045 | 2,617
Revenue from other sources | 761 | 843 | 903
Non-interest income (loss) | 3,823 | 3,888 | 3,520
Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 436 | 604 | 661
Revenue from other sources | 30 | 39 | 2
Non-interest income (loss) | 466 | 643 | 663
Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 242 | 178 | 158
Revenue from other sources | 681 | 653 | 586
Non-interest income (loss) | 923 | 831 | 744
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (3) | (7) | (5)
Revenue from other sources | 401 | (102) | 279
Non-interest income (loss) | 398 | (109) | 274
Interchange fees, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3,017 | 3,179 | 2,823
Customer reward expenses | 4,900 | 4,900 | 4,400
Interchange fees, net | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 2,747 | 2,925 | 2,609
Interchange fees, net | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 209 | 205 | 185
Interchange fees, net | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 63 | 55 | 33
Interchange fees, net | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (2) | (6) | (4)
Service changes and other customer-related fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 362 | 417 | 489
Service changes and other customer-related fees | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 0 | 0 | 0
Service changes and other customer-related fees | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 188 | 298 | 367
Service changes and other customer-related fees | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 175 | 120 | 123
Service changes and other customer-related fees | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (1) | (1) | (1)
Other contract revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 358 | 224 | 119
Other contract revenue | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 315 | 120 | 8
Other contract revenue | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 39 | 101 | 109
Other contract revenue | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 4 | 3 | 2
Other contract revenue | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | $ 0 | $ 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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: 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=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: 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=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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