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Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Corporate Bank [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | $ 370 | $ 373 | $ 389
Corporate Bank [Member] | Asset Management Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Corporate Bank [Member] | Service charges on deposit accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 193 | 177 | 160
Corporate Bank [Member] | Card and ATM fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 45 | 45 | 41
Corporate Bank [Member] | Capital markets income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 92 | 108 | 149
Corporate Bank [Member] | Mortgage income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Corporate Bank [Member] | Investment Services Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Corporate Bank [Member] | Commercial Credit Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Corporate Bank [Member] | Bank-owned life insurance [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Corporate Bank [Member] | Insurance Proceeds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  | 0 |
Corporate Bank [Member] | Securities gains, net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Corporate Bank [Member] | Market value adjustments on employee benefit assets - other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Corporate Bank [Member] | Valuation Gain on Equity Investments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  |  | 0
Corporate Bank [Member] | Other miscellaneous income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 40 | 43 | 39
Consumer Bank [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 893 | 966 | 983
Consumer Bank [Member] | Asset Management Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Service charges on deposit accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 396 | 458 | 480
Consumer Bank [Member] | Card and ATM fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 446 | 457 | 448
Consumer Bank [Member] | Capital markets income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Mortgage income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Investment Services Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Commercial Credit Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Bank-owned life insurance [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Insurance Proceeds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  | 0 |
Consumer Bank [Member] | Securities gains, net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Market value adjustments on employee benefit assets - other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Consumer Bank [Member] | Valuation Gain on Equity Investments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  |  | 0
Consumer Bank [Member] | Other miscellaneous income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 51 | 51 | 55
Wealth Management [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 457 | 425 | 389
Wealth Management [Member] | Asset Management Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 313 | 297 | 278
Wealth Management [Member] | Service charges on deposit accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 3 | 3 | 3
Wealth Management [Member] | Card and ATM fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 1 | 0 | 0
Wealth Management [Member] | Capital markets income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Wealth Management [Member] | Mortgage income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Wealth Management [Member] | Investment Services Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 138 | 122 | 104
Wealth Management [Member] | Commercial Credit Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Wealth Management [Member] | Bank-owned life insurance [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Wealth Management [Member] | Insurance Proceeds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  | 0 |
Wealth Management [Member] | Securities gains, net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Wealth Management [Member] | Market value adjustments on employee benefit assets - other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Wealth Management [Member] | Valuation Gain on Equity Investments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  |  | 0
Wealth Management [Member] | Other miscellaneous income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 2 | 3 | 4
Other Segment Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 2 | 2 | 2
Other Segment Revenue [Member] | Asset Management Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Segment Revenue [Member] | Service charges on deposit accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 2 | 0
Other Segment Revenue [Member] | Card and ATM fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 1 | 0 | (1)
Other Segment Revenue [Member] | Capital markets income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 1 | 0 | 0
Other Segment Revenue [Member] | Mortgage income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Segment Revenue [Member] | Investment Services Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Segment Revenue [Member] | Commercial Credit Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Segment Revenue [Member] | Bank-owned life insurance [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Segment Revenue [Member] | Insurance Proceeds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  | 0 |
Other Segment Revenue [Member] | Securities gains, net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Segment Revenue [Member] | Market value adjustments on employee benefit assets - other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Segment Revenue [Member] | Valuation Gain on Equity Investments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  |  | 0
Other Segment Revenue [Member] | Other miscellaneous income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 3
Other Revenue - Not Impacted [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 534 | 663 | 761
Other Revenue - Not Impacted [Member] | Asset Management Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Revenue - Not Impacted [Member] | Service charges on deposit accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 1 | 5
Other Revenue - Not Impacted [Member] | Card and ATM fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 11 | 11 | 11
Other Revenue - Not Impacted [Member] | Capital markets income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 129 | 231 | 182
Other Revenue - Not Impacted [Member] | Mortgage income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 109 | 156 | 242
Other Revenue - Not Impacted [Member] | Investment Services Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 0 | 0 | 0
Other Revenue - Not Impacted [Member] | Commercial Credit Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 105 | 96 | 91
Other Revenue - Not Impacted [Member] | Bank-owned life insurance [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 78 | 62 | 82
Other Revenue - Not Impacted [Member] | Insurance Proceeds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  | 50 |
Other Revenue - Not Impacted [Member] | Securities gains, net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | (5) | (1) | 3
Other Revenue - Not Impacted [Member] | Market value adjustments on employee benefit assets - other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 15 | (45) | 20
Other Revenue - Not Impacted [Member] | Valuation Gain on Equity Investments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  |  | 3
Other Revenue - Not Impacted [Member] | Other miscellaneous income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 92 | 102 | 122
Continuing Operations [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 2,256 | 2,429 | 2,524
Continuing Operations [Member] | Asset Management Income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 313 | 297 | 278
Continuing Operations [Member] | Service charges on deposit accounts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 592 | 641 | 648
Continuing Operations [Member] | Card and ATM fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 504 | 513 | 499
Continuing Operations [Member] | Capital markets income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 222 | 339 | 331
Continuing Operations [Member] | Mortgage income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 109 | 156 | 242
Continuing Operations [Member] | Investment Services Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 138 | 122 | 104
Continuing Operations [Member] | Commercial Credit Fee Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 105 | 96 | 91
Continuing Operations [Member] | Bank-owned life insurance [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 78 | 62 | 82
Continuing Operations [Member] | Insurance Proceeds |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  | 50 |
Continuing Operations [Member] | Securities gains, net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | (5) | (1) | 3
Continuing Operations [Member] | Market value adjustments on employee benefit assets - other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | 15 | (45) | 20
Continuing Operations [Member] | Valuation Gain on Equity Investments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax |  |  | 3
Continuing Operations [Member] | Other miscellaneous income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
RevenueFromContractWithCustomerExcludingAssessedTax | $ 185 | $ 199 | $ 223

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