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Fee-based Revenue from Contracts with Customers - Corporate & Institutional Banking Noninterest Income Disaggregation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | $ 6,955 | $ 6,874 | $ 6,469
Corporate & Institutional Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 3,062 | 2,537 | 2,406
Corporate & Institutional Banking | In-Scope Corporate and Institutional Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 1,850 | 1,566 | 1,454
Corporate & Institutional Banking | Out-of-Scope Corporate and Institutional Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 1,212 | 971 | 952
Corporate & Institutional Banking | Treasury management fees | In-Scope Corporate and Institutional Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 897 | 840 | 776
Corporate & Institutional Banking | Capital markets fees | In-Scope Corporate and Institutional Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 759 | 547 | 510
Corporate & Institutional Banking | Commercial mortgage banking activities | In-Scope Corporate and Institutional Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 111 | 102 | 87
Corporate & Institutional Banking | Other | In-Scope Corporate and Institutional Banking Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | $ 83 | $ 77 | $ 81

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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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