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Fee-based Revenue from Contracts with Customers - Retail Banking Noninterest Income Disaggregation (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract] |  |  |
Number of reportable segments | segment | 3 |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | $ 6,955 | $ 6,874 | $ 6,469
Retail Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 2,519 | 2,648 | 2,631
Retail Banking | In-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 1,910 | 2,190 | 2,158
Retail Banking | Out-of-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 609 | 458 | 473
Retail Banking | Debit card fees | In-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 522 | 535 | 505
Retail Banking | Deposit account fees | In-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 463 | 642 | 618
Retail Banking | Brokerage fees | In-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 367 | 356 | 350
Retail Banking | Net credit card fees | In-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 179 | 186 | 189
Interchange Fees | 469 | 498 | 452
Credit card reward costs | 290 | 312 | 263
Retail Banking | Merchant services | In-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 154 | 216 | 212
Retail Banking | Other | In-Scope Retail Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | $ 225 | $ 255 | $ 284

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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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