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Business Segment Information - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Deposit transactions and cash management | $ 179 | $ 171 | $ 175
Fixed income | 133 | 205 | 406
Brokerage, management fees and commissions | 90 | 92 | 88
Card and digital banking fees | 77 | 84 | 78
Other service charges and fees | 54 | 54 | 44
Trust services and investment management | 47 | 48 | 51
Mortgage banking and title income | 23 | 68 | 154
Gain on merger termination | 225 | 0 | 0
Securities gains (losses), net | (4) | 18 | 13
Other income (loss) | 103 | 75 | 67
Total noninterest income | 927 | 815 | 1,076
Underwriting, Portfolio Advisory, and Other Noninterest Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer | 42 | 43 | 44
Regional Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deposit transactions and cash management | 161 | 153 | 157
Fixed income | 0 | 0 | 0
Brokerage, management fees and commissions | 90 | 92 | 88
Card and digital banking fees | 68 | 75 | 67
Other service charges and fees | 30 | 32 | 23
Trust services and investment management | 47 | 48 | 51
Mortgage banking and title income | 0 | 0 | 0
Gain on merger termination | 0 |  |
Securities gains (losses), net | 0 | 0 | 0
Other income (loss) | 37 | 43 | 52
Total noninterest income | 433 | 443 | 438
Specialty Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deposit transactions and cash management | 10 | 9 | 12
Fixed income | 133 | 205 | 406
Brokerage, management fees and commissions | 0 | 0 | 0
Card and digital banking fees | 2 | 2 | 3
Other service charges and fees | 24 | 22 | 17
Trust services and investment management | 0 | 0 | 0
Mortgage banking and title income | 23 | 68 | 152
Gain on merger termination | 0 |  |
Securities gains (losses), net | 0 | 0 | 0
Other income (loss) | 17 | 6 | 7
Total noninterest income | 209 | 312 | 597
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deposit transactions and cash management | 8 | 9 | 6
Fixed income | 0 | 0 | 0
Brokerage, management fees and commissions | 0 | 0 | 0
Card and digital banking fees | 7 | 7 | 8
Other service charges and fees | 0 | 0 | 4
Trust services and investment management | 0 | 0 | 0
Mortgage banking and title income | 0 | 0 | 2
Gain on merger termination | 225 |  |
Securities gains (losses), net | (4) | 18 | 13
Other income (loss) | 49 | 26 | 8
Total noninterest income | $ 285 | $ 60 | $ 41

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- Definition Acting as an agent, a broker-dealer may buy and sell securities on behalf of its customers. In return for such services, the broker-dealer charges a commission. Each time a customer enters into a buy or sell transaction, a commission is earned by the broker-dealer for its selling and administrative efforts. For securities purchased, the commission is recorded as a receivable from customers; for securities sold, it is recorded as reductions in the payable to customers. Commissions earned are usually related to the broker-dealer's customers' trading volume and the dollar amounts of the trades. In general, commissions are for smaller trades of exchange-listed stocks and bonds made by retail customers. Revenue recognized in the period for (1) performance (incentive) fees based on the investment results achieved for management of certain institutional accounts and hedge funds, (2) schedule-based fees earned for management of mutual funds and closed-end funds, based either on average daily net assets or on a combination of the average daily net assets and gross income, and (3) other investment management and advisory fees. + References No definition available. + Details
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- Definition The major component of revenue in this line item is generated from the purchase and sale of securities as both principal and agent, and from other fee sources including loan sales, portfolio advisory, and derivative sales. + References No definition available. + Details
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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Subsection Instruction 3 -Publisher SEC + Details
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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 -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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