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Business Segment Reporting - Financial Information of Business Groups (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
employee
Dec. 31, 2022
USD ($)
employee
Dec. 31, 2021
USD ($)
employee
Segment Reporting Information [Line Items]      
Net interest income (TE) $ 3,943 $ 4,554 $ 4,098
Noninterest income 2,470 2,718 3,194
Total revenue (TE) 6,413 7,272 7,292
Provision for credit losses 489 502 (418)
Depreciation and amortization expense 232 271 298
Other noninterest expense 4,502 4,139 4,131
Income (loss) from continuing operations before income taxes (TE) 1,190 2,360 3,281
Allocated income taxes (benefit) and TE adjustments 226 449 669
INCOME (LOSS) FROM CONTINUING OPERATIONS 964 1,911 2,612
Income (loss) from discontinued operations, net of taxes 3 6 13
NET INCOME (LOSS) 967 1,917 2,625
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 967 1,917 2,625
AVERAGE BALANCES      
Loans and leases 118,004 111,302 100,269
Total assets 191,627 185,886 178,919
Deposits 144,059 146,862 145,035
OTHER FINANCIAL DATA      
Expenditures for additions to long-lived assets 193 254 114
Net loan charge-offs $ 244 $ 161 $ 184
Return on average allocated equity 6.94% 12.97% 14.79%
Return on average allocated equity 6.97% 13.01% 14.86%
Average full-time equivalent employees | employee 17,692 17,661 16,974
Operating Segments | Consumer Bank      
Segment Reporting Information [Line Items]      
Net interest income (TE) $ 2,276 $ 2,409 $ 2,361
Noninterest income 944 995 1,068
Total revenue (TE) 3,220 3,404 3,429
Provision for credit losses 111 193 (118)
Depreciation and amortization expense 106 87 84
Other noninterest expense 2,677 2,644 2,321
Income (loss) from continuing operations before income taxes (TE) 326 480 1,142
Allocated income taxes (benefit) and TE adjustments 78 115 274
INCOME (LOSS) FROM CONTINUING OPERATIONS 248 365 868
Income (loss) from discontinued operations, net of taxes 0 0 0
NET INCOME (LOSS) 248 365 868
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 248 365 868
AVERAGE BALANCES      
Loans and leases 42,408 41,315 39,422
Total assets 45,232 44,414 42,656
Deposits 83,964 90,132 88,474
OTHER FINANCIAL DATA      
Expenditures for additions to long-lived assets 72 52 39
Net loan charge-offs $ 133 $ 83 $ 126
Return on average allocated equity 6.92% 10.36% 24.31%
Return on average allocated equity 6.92% 10.36% 24.31%
Average full-time equivalent employees | employee 7,773 8,101 8,043
Operating Segments | Commercial Bank      
Segment Reporting Information [Line Items]      
Net interest income (TE) $ 1,811 $ 1,863 $ 1,650
Noninterest income 1,422 1,600 1,990
Total revenue (TE) 3,233 3,463 3,640
Provision for credit losses 379 317 (279)
Depreciation and amortization expense 99 113 134
Other noninterest expense 1,703 1,620 1,732
Income (loss) from continuing operations before income taxes (TE) 1,052 1,413 2,053
Allocated income taxes (benefit) and TE adjustments 213 269 412
INCOME (LOSS) FROM CONTINUING OPERATIONS 839 1,144 1,641
Income (loss) from discontinued operations, net of taxes 0 0 0
NET INCOME (LOSS) 839 1,144 1,641
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 839 1,144 1,641
AVERAGE BALANCES      
Loans and leases 75,143 69,549 60,486
Total assets 84,895 80,068 70,051
Deposits 53,874 54,672 55,598
OTHER FINANCIAL DATA      
Expenditures for additions to long-lived assets 3 4 12
Net loan charge-offs $ 111 $ 84 $ 81
Return on average allocated equity 8.14% 12.57% 19.21%
Return on average allocated equity 8.14% 12.57% 19.21%
Average full-time equivalent employees | employee 2,484 2,466 2,384
Other      
Segment Reporting Information [Line Items]      
Net interest income (TE) $ (144) $ 282 $ 87
Noninterest income 104 123 136
Total revenue (TE) (40) 405 223
Provision for credit losses (1) (8) (21)
Depreciation and amortization expense 27 71 80
Other noninterest expense 122 (125) 78
Income (loss) from continuing operations before income taxes (TE) (188) 467 86
Allocated income taxes (benefit) and TE adjustments (65) 65 (17)
INCOME (LOSS) FROM CONTINUING OPERATIONS (123) 402 103
Income (loss) from discontinued operations, net of taxes 3 6 13
NET INCOME (LOSS) (120) 408 116
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY (120) 408 116
AVERAGE BALANCES      
Loans and leases 453 438 361
Total assets 61,500 61,404 66,212
Deposits 6,221 2,058 963
OTHER FINANCIAL DATA      
Expenditures for additions to long-lived assets 118 198 63
Net loan charge-offs $ 0 $ (6) $ (23)
Return on average allocated equity 1025.00% 19.12% 1.85%
Return on average allocated equity 1000.00% 19.40% 2.09%
Average full-time equivalent employees | employee 7,435 7,094 6,547