v3.19.3.a.u2
Revenue Recognition (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Corporate Bank [Member]      
Disaggregation of Revenue [Line Items]      
Revenue $ 295 $ 286 $ 248 [1]
Corporate Bank [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
Revenue 154 145 140
Corporate Bank [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
Revenue 54 52 47
Corporate Bank [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 69 76 48
Corporate Bank [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Corporate Bank [Member] | Insurance commissions and fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   0 0
Corporate Bank [Member] | Gain on sale of business [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   0  
Corporate Bank [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 18 13 13
Consumer Bank [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 1,045 1,000 957 [1]
Consumer Bank [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
Revenue 565 554 530
Consumer Bank [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
Revenue 422 404 382
Consumer Bank [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Consumer Bank [Member] | Insurance commissions and fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   0 0
Consumer Bank [Member] | Gain on sale of business [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   0  
Consumer Bank [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 58 42 45
Wealth Management [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 331 314 298 [1]
Wealth Management [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
Revenue 3 3 3
Wealth Management [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
Revenue 1 1 0
Wealth Management [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
Revenue 243 235 230
Wealth Management [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Wealth Management [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Wealth Management [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 79 71 60
Wealth Management [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Wealth Management [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Wealth Management [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Wealth Management [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Wealth Management [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Wealth Management [Member] | Insurance commissions and fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   1 1
Wealth Management [Member] | Gain on sale of business [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   0  
Wealth Management [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 5 3 4
Other Segment Revenue [Member]      
Disaggregation of Revenue [Line Items]      
Revenue (2) 1 6 [1]
Other Segment Revenue [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 1
Other Segment Revenue [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
Revenue 0 (1) 1
Other Segment Revenue [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Other Segment Revenue [Member] | Insurance commissions and fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   3 4
Other Segment Revenue [Member] | Gain on sale of business [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   0  
Other Segment Revenue [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue (2) (1) 0
Other Revenue - Not Impacted [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 447 418 453 [1]
Other Revenue - Not Impacted [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
Revenue [2] 7 8 9
Other Revenue - Not Impacted [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
Revenue [2] (22) (18) (13)
Other Revenue - Not Impacted [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
Revenue [2] 0 0 0
Other Revenue - Not Impacted [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 109 126 113
Other Revenue - Not Impacted [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
Revenue [2] 163 137 149
Other Revenue - Not Impacted [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 0 0 0
Other Revenue - Not Impacted [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 73 71 71
Other Revenue - Not Impacted [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 78 65 81
Other Revenue - Not Impacted [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] (28) 1 19
Other Revenue - Not Impacted [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 5 (6) 0
Other Revenue - Not Impacted [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 11 (5) 16
Other Revenue - Not Impacted [Member] | Insurance commissions and fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2]   0 0
Other Revenue - Not Impacted [Member] | Gain on sale of business [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2]   0  
Other Revenue - Not Impacted [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2] 51 39 8
Continuing Operations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 2,116 2,019 1,962 [1]
Continuing Operations [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
Revenue 729 710 683
Continuing Operations [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
Revenue 455 438 417
Continuing Operations [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
Revenue 243 235 230
Continuing Operations [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 178 202 161
Continuing Operations [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
Revenue 163 137 149
Continuing Operations [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 79 71 60
Continuing Operations [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 73 71 71
Continuing Operations [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 78 65 81
Continuing Operations [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue (28) 1 19
Continuing Operations [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 5 (6) 0
Continuing Operations [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 11 (5) 16
Continuing Operations [Member] | Insurance commissions and fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   4 5
Continuing Operations [Member] | Gain on sale of business [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2]   0  
Continuing Operations [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 130 96 70
Discontinued Operations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 349 146 [1]
Discontinued Operations [Member] | Service charges on deposit accounts      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Card and ATM fees      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Investment management and trust fee income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Capital markets income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Mortgage income      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Investment Services Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Commercial Credit Fee Income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Bank-owned life insurance [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Securities gains, net [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 (1) 3
Discontinued Operations [Member] | Market value adjustments on employee benefit assets - defined benefit [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Market value adjustments on employee benefit assets - other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue 0 0 0
Discontinued Operations [Member] | Insurance commissions and fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue   69 140
Discontinued Operations [Member] | Gain on sale of business [Member]      
Disaggregation of Revenue [Line Items]      
Revenue [2]   281  
Discontinued Operations [Member] | Other miscellaneous income [Member]      
Disaggregation of Revenue [Line Items]      
Revenue $ 0 $ 0 $ 3
[1]
The amounts included for 2017 have not been adjusted under the modified retrospective method.
[2]
This revenue is not impacted by the new accounting guidance and continues to be recognized when earned in accordance with the Company's existing revenue recognition policy.