v3.22.0.1
Revenue Recognition (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Corporate Bank [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax $ 389 $ 354 $ 295
Corporate Bank [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 160 152 154
Corporate Bank [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 41 43 54
Corporate Bank [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 0 0
Corporate Bank [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 149 126 69
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] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 0 0
Corporate Bank [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax     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] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 39 33 18
Consumer Bank [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 983 893 1,045
Consumer Bank [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 480 459 565
Consumer Bank [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 448 385 422
Consumer Bank [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 0 0
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] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 0 0
Consumer Bank [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax     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] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 55 49 58
Wealth Management [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 389 343 331
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 0 0 1
Wealth Management [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 278 253 243
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 104 84 79
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] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 0 0
Wealth Management [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax     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] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 4 3 5
Other Segment Revenue [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 2 3 (2)
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) (1) 0
Other Segment Revenue [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 0 0
Other Segment Revenue [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 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] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 0 0 0
Other Segment Revenue [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax     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] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 3 2 (2)
Other Revenue - Not Impacted [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 761 800 447
Other Revenue - Not Impacted [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 5 5 7
Other Revenue - Not Impacted [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 11 11 (22)
Other Revenue - Not Impacted [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 0 0 0
Other Revenue - Not Impacted [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 182 149 109
Other Revenue - Not Impacted [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 242 333 163
Other Revenue - Not Impacted [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 0 0 0
Other Revenue - Not Impacted [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 91 77 73
Other Revenue - Not Impacted [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 82 95 78
Other Revenue - Not Impacted [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 3 4 (28)
Other Revenue - Not Impacted [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1]     5
Other Revenue - Not Impacted [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 20 12 11
Other Revenue - Not Impacted [Member] | Valuation Gain on Equity Investments [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [2] 3 50  
Other Revenue - Not Impacted [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [1] 122 64 51
Continuing Operations [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 2,524 2,393 2,116
Continuing Operations [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 648 621 729
Continuing Operations [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 499 438 455
Continuing Operations [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 278 253 243
Continuing Operations [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 331 275 178
Continuing Operations [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 242 333 163
Continuing Operations [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 104 84 79
Continuing Operations [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 91 77 73
Continuing Operations [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 82 95 78
Continuing Operations [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 3 4 (28)
Continuing Operations [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax     5
Continuing Operations [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax 20 12 11
Continuing Operations [Member] | Valuation Gain on Equity Investments [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax [2] 3 50  
Continuing Operations [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
RevenueFromContractWithCustomerExcludingAssessedTax $ 223 $ 151 $ 130
[1] (2)This revenue is not impacted by the accounting guidance adopted in 2018 and continues to be recognized when earned in accordance with the Company's prior revenue recognition policy.
[2] The 2021 amount is a gain on the sale of an equity investment, whereas the 2020 amount is a valuation gain on the investment that was sold in the first quarter of 2021.