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Fee-based Revenue from Contracts with Customers - Asset Management Group 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
Asset Management Group |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 854 | 991 | 892
Asset Management Group | In-Scope Asset Management Group Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 836 | 862 | 883
Asset Management Group | Out-of-Scope Asset Management Group Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 18 | 129 | 9
Asset Management Group | Personal | In-Scope Asset Management Group Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | 634 | 620 | 611
Asset Management Group | Institutional | In-Scope Asset Management Group Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | $ 202 | $ 242 | $ 272

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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