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Condensed Financial Information of the Parent Company - Condensed Statements of Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Other income [1] $ 35 $ 31 $ 120
Total interest income 7,927 5,412 4,367
Interest on long-term debt with subsidiary trusts 1,305 475 221
Income (loss) from continuing operations before income taxes (TE) 1,190 2,360 3,281
Income tax (expense) benefit (196) (422) (642)
NET INCOME (LOSS) 967 1,917 2,625
Less: Net income attributable to noncontrolling interests 0 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 967 1,917 2,625
Key      
Condensed Financial Statements, Captions [Line Items]      
Interest income from subsidiaries 15 4 1
Other income 24 7 36
Total interest income 714 586 2,012
Interest on long-term debt with subsidiary trusts 33 19 13
Interest on other borrowed funds 273 130 65
Personnel and other expense 111 101 101
Total expense 417 250 179
Income (loss) from continuing operations before income taxes (TE) 297 336 1,833
Income tax (expense) benefit 95 60 38
Income (loss) before equity in net income (loss) less dividends from subsidiaries 392 396 1,871
Equity in net income (loss) less dividends from subsidiaries 575 1,521 754
NET INCOME (LOSS) 967 1,917 2,625
Less: Net income attributable to noncontrolling interests 0 0 0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY 967 1,917 2,625
Key | Banks      
Condensed Financial Statements, Captions [Line Items]      
Dividends from subsidiaries: 675 475 1,925
Key | Nonbank subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Dividends from subsidiaries: $ 0 $ 100 $ 50
[1] Net securities gains (losses) totaled $(11) million for the year ended December 31, 2023, $9 million for the year ended December 31, 2022, and $7 million for the year ended December 31, 2021.