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Business Segment Reporting - Financial Information of Business Groups (Details) $ in Millions | 12 Months Ended
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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

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