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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | $ 4,780 | $ 3,737 | $ 3,820
Revenue (reduction) from other sources | 1,484 | 1,873 | 1,433
Non-interest income (loss) | 6,264 | 5,610 | 5,253
Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3,880 | 3,062 | 3,045
Revenue (reduction) from other sources | 926 | 761 | 843
Non-interest income (loss) | 4,806 | 3,823 | 3,888
Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 513 | 436 | 604
Revenue (reduction) from other sources | 41 | 30 | 39
Non-interest income (loss) | 554 | 466 | 643
Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 388 | 242 | 178
Revenue (reduction) from other sources | 760 | 681 | 653
Non-interest income (loss) | 1,148 | 923 | 831
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (1) | (3) | (7)
Revenue (reduction) from other sources | (243) | 401 | (102)
Non-interest income (loss) | (244) | 398 | (109)
Interchange fees, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3,860 | 3,017 | 3,179
Customer reward expenses | 6,400 | 4,900 | 4,900
Interchange fees, net | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 3,497 | 2,747 | 2,925
Interchange fees, net | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 267 | 209 | 205
Interchange fees, net | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 96 | 63 | 55
Interchange fees, net | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 0 | (2) | (6)
Service charges and other customer-related fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 457 | 362 | 417
Service charges and other customer-related fees | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 0 | 0 | 0
Service charges and other customer-related fees | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 171 | 188 | 298
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 287 | 175 | 120
Service charges and other customer-related fees | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | (1) | (1) | (1)
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 463 | 358 | 224
Other | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 383 | 315 | 120
Other | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 75 | 39 | 101
Other | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue | 5 | 4 | 3
Other | 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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123351226&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=123359005&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=123359005&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=123359005&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=123351226&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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