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Business Segment Reporting - Schedule of Segment Reporting Information (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
employee
Mar. 31, 2020
USD ($)
employee
SUMMARY OF OPERATIONS    
Net interest income (TE) $ 1,012 $ 989
Noninterest income 738 477
Total revenue (TE) 1,750 1,466
Provision for credit losses (93) 359
Depreciation and amortization expense 90 92
Other noninterest expense 981 839
Income (loss) from continuing operations before income taxes (TE) 772 176
Allocated income taxes and TE adjustments 154 31
INCOME (LOSS) FROM CONTINUING OPERATIONS 618 145
Income (loss) from discontinued operations, net of taxes 4 1
NET INCOME (LOSS) 622 146
Less: Net income (loss) attributable to noncontrolling interests 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 622 146
AVERAGE BALANCES    
Loans and leases 100,728 96,174
Total assets 172,233 146,228
Deposits 137,740 110,328
OTHER FINANCIAL DATA    
Net loan charge-offs $ 114 $ 84
Return on average allocated equity, continuing operations (as a percent) 14.11% 3.39%
Return on average allocated equity (as a percent) 14.20% 3.41%
Average full-time equivalent employees | employee 17,086 16,529
Operating Segments | Consumer Bank    
SUMMARY OF OPERATIONS    
Net interest income (TE) $ 607 $ 581
Noninterest income 257 229
Total revenue (TE) 864 810
Provision for credit losses (23) 136
Depreciation and amortization expense 18 21
Other noninterest expense 583 518
Income (loss) from continuing operations before income taxes (TE) 286 135
Allocated income taxes and TE adjustments 69 32
INCOME (LOSS) FROM CONTINUING OPERATIONS 217 103
Income (loss) from discontinued operations, net of taxes 0 0
NET INCOME (LOSS) 217 103
Less: Net income (loss) attributable to noncontrolling interests 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 217 103
AVERAGE BALANCES    
Loans and leases 39,249 33,175
Total assets 42,476 36,415
Deposits 85,033 73,133
OTHER FINANCIAL DATA    
Net loan charge-offs $ 36 $ 43
Return on average allocated equity, continuing operations (as a percent) 25.76% 12.30%
Return on average allocated equity (as a percent) 25.76% 12.30%
Average full-time equivalent employees | employee 8,284 8,144
Operating Segments | Commercial Bank    
SUMMARY OF OPERATIONS    
Net interest income (TE) $ 411 $ 421
Noninterest income 447 220
Total revenue (TE) 858 641
Provision for credit losses (67) 222
Depreciation and amortization expense 34 36
Other noninterest expense 409 326
Income (loss) from continuing operations before income taxes (TE) 482 57
Allocated income taxes and TE adjustments 99 (9)
INCOME (LOSS) FROM CONTINUING OPERATIONS 383 66
Income (loss) from discontinued operations, net of taxes 0 0
NET INCOME (LOSS) 383 66
Less: Net income (loss) attributable to noncontrolling interests 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 383 66
AVERAGE BALANCES    
Loans and leases 60,885 62,104
Total assets 70,114 71,410
Deposits 51,894 36,443
OTHER FINANCIAL DATA    
Net loan charge-offs $ 78 $ 40
Return on average allocated equity, continuing operations (as a percent) 17.47% 5.57%
Return on average allocated equity (as a percent) 17.47% 5.57%
Average full-time equivalent employees | employee 2,066 2,091
Other    
SUMMARY OF OPERATIONS    
Net interest income (TE) $ (6) $ (13)
Noninterest income 34 28
Total revenue (TE) 28 15
Provision for credit losses (3) 1
Depreciation and amortization expense 38 35
Other noninterest expense (11) (5)
Income (loss) from continuing operations before income taxes (TE) 4 (16)
Allocated income taxes and TE adjustments (14) 8
INCOME (LOSS) FROM CONTINUING OPERATIONS 18 (24)
Income (loss) from discontinued operations, net of taxes 4 1
NET INCOME (LOSS) 22 (23)
Less: Net income (loss) attributable to noncontrolling interests 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 22 (23)
AVERAGE BALANCES    
Loans and leases 594 895
Total assets 59,643 38,403
Deposits 813 752
OTHER FINANCIAL DATA    
Net loan charge-offs $ 0 $ 1
Return on average allocated equity, continuing operations (as a percent) 1.34% (1.06%)
Return on average allocated equity (as a percent) 1.63% (1.02%)
Average full-time equivalent employees | employee 6,736 6,294