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Line of Business Results (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
SUMMARY OF OPERATIONS        
Net interest income $ 564 $ 617 $ 1,161 $ 1,242
Total noninterest income 454 492 911 942
Provision (credit) for loan and lease losses (8) 228 (48) 641
Other noninterest expense 41 66 58 105
Income (loss) from continuing operations before income taxes (TE) 346 112 739 (11)
Allocated income taxes and TE adjustments 94 11 205 (71)
Income (loss) from continuing operations 252 101 534 60
Income (loss) from discontinued operations, net of taxes (9) (27) (20) (25)
Net income (loss) 243 74 514 35
Less: Net income (loss) attributable to noncontrolling interests 3 4 11 20
Net income (loss) attributable to Key 240 70 503 15
Line of Business Results (Textuals) [Abstract]        
Federal income tax rate     35.00%  
State income tax rate     2.20%  
Percentage of debt service provided by rental income from nonaffiliated third parties     at least 50% of the debt service is provided by rental income from nonaffiliated third parties  
Community Banking [Member]
        
SUMMARY OF OPERATIONS        
Net interest income 374 408 752 820
Total noninterest income 185 194 371 376
Total revenue (TE) 559 602 1,123 1,196
Provision (credit) for loan and lease losses 79 121 90 263
Depreciation and amortization expense 10 9 19 18
Other noninterest expense 438 443 873 886
Income (loss) from continuing operations before income taxes (TE) 32 29 141 29
Allocated income taxes and TE adjustments (2) (2) 26 (14)
Income (loss) from continuing operations 34 31 115 43
Net income (loss) 34 31 115 43
Net income (loss) attributable to Key 34 31 115 43
AVERAGE BALANCES        
Loans and leases 26,242 27,217 26,277 27,491
Total assets 29,688 30,303 29,713 30,593
Deposits 47,719 50,406 47,912 50,922
OTHER FINANCIAL DATA        
Net loan charge-offs 79 148 155 264
Return on average allocated equity 4.26% 3.49% 7.16% 2.43%
Return on average allocated equity, Total 4.26% 3.49% 7.16% 2.43%
Average full-time equivalent employees 8,504 8,241 8,441 8,212
Corporate Banking [Member]
        
SUMMARY OF OPERATIONS        
Net interest income 174 198 358 394
Total noninterest income 215 208 434 385
Total revenue (TE) 389 406 792 779
Provision (credit) for loan and lease losses (76) 99 (97) 260
Depreciation and amortization expense 19 24 39 49
Other noninterest expense 187 225 395 472
Income (loss) from continuing operations before income taxes (TE) 259 58 455 (2)
Allocated income taxes and TE adjustments 95 20 167 (4)
Income (loss) from continuing operations 164 38 288 2
Net income (loss) 164 38 288 2
Less: Net income (loss) attributable to noncontrolling interests 1 0   0
Net income (loss) attributable to Key 163 38 288 2
AVERAGE BALANCES        
Loans and leases 17,168 20,949 17,421 21,691
Total assets 21,468 24,789 21,607 25,525
Deposits 10,195 12,391 10,736 12,306
OTHER FINANCIAL DATA        
Net loan charge-offs 29 173 104 424
Return on average allocated equity 28.11% 4.58% 23.69% 0.12%
Return on average allocated equity, Total 28.11% 4.58% 23.69% 0.12%
Average full-time equivalent employees 2,191 2,175 2,173 2,194
Other Segments [Member]
        
SUMMARY OF OPERATIONS        
Net interest income 16 9 50 27
Total noninterest income 54 85 115 171
Total revenue (TE) 70 94 165 198
Provision (credit) for loan and lease losses (10) 7 (35) 128
Depreciation and amortization expense 5 12 10 23
Other noninterest expense 20 41 43 82
Income (loss) from continuing operations before income taxes (TE) 55 34 147 (35)
Allocated income taxes and TE adjustments 10 2 34 (34)
Income (loss) from continuing operations 45 32 113 (1)
Net income (loss) 45 [1] 32 113 (1)
Less: Net income (loss) attributable to noncontrolling interests 2 4 11 20
Net income (loss) attributable to Key 43 28 102 (21)
AVERAGE BALANCES        
Loans and leases 4,980 6,738 5,133 7,047
Total assets 28,959 30,597 30,151 29,978
Deposits 777 1,672 783 1,763
OTHER FINANCIAL DATA        
Net loan charge-offs 26 115 69 269
Return on average allocated equity 22.46% 10.22% 26.30% (3.74%)
Return on average allocated equity, Total 22.46% 10.22% 26.30% (3.74%)
Average full-time equivalent employees 23 191 43 195
Total Segments [Member]
        
SUMMARY OF OPERATIONS        
Net interest income 564 615 1,160 1,241
Total noninterest income 454 487 920 932
Total revenue (TE) 1,018 1,102 2,080 2,173
Provision (credit) for loan and lease losses (7) 227 (42) 651
Depreciation and amortization expense 34 45 68 90
Other noninterest expense 645 709 1,311 1,440
Income (loss) from continuing operations before income taxes (TE) 346 121 743 (8)
Allocated income taxes and TE adjustments 103 20 227 (52)
Income (loss) from continuing operations 243 101 516 44
Net income (loss) 243 101 516 44
Less: Net income (loss) attributable to noncontrolling interests 3 4 11 20
Net income (loss) attributable to Key 240 97 505 24
AVERAGE BALANCES        
Loans and leases 48,390 54,904 48,831 56,229
Total assets 80,115 85,689 81,471 86,096
Deposits 58,691 64,469 59,431 64,991
OTHER FINANCIAL DATA        
Net loan charge-offs 134 436 328 957
Return on average allocated equity 15.28% 4.87% 15.73% 0.60%
Return on average allocated equity, Total 15.28% 4.87% 15.73% 0.60%
Average full-time equivalent employees 10,718 10,607 10,657 10,601
Reconciling Items [Member]
        
SUMMARY OF OPERATIONS        
Net interest income 6 8 14 14
Total noninterest income   5 (9) 10
Total revenue (TE) 6 13 5 24
Provision (credit) for loan and lease losses (1) 1 (6) (10)
Depreciation and amortization expense 35 40 75 83
Other noninterest expense (34) (25) (73) (59)
Income (loss) from continuing operations before income taxes (TE) 6 (3) 9 10
Allocated income taxes and TE adjustments (3) (3) (9) (6)
Income (loss) from continuing operations 9   18 16
Income (loss) from discontinued operations, net of taxes (9) (27) (20) (25)
Net income (loss)   (27) (2) (9)
Net income (loss) attributable to Key   (27) (2) (9)
AVERAGE BALANCES        
Loans and leases 64 49 50 53
Total assets 1,271 2,187 1,361 2,187
Deposits (150) (60) (145) (109)
OTHER FINANCIAL DATA        
Net loan charge-offs   (1) (1) 0
Return on average allocated equity 1.11%   0.93% 1.22%
Return on average allocated equity, Total   (4.07%) (0.10%) (0.69%)
Average full-time equivalent employees 4,631 5,058 4,669 5,117
Key [Member]
        
SUMMARY OF OPERATIONS        
Net interest income 570 623 1,174 1,255
Total noninterest income 454 492 911 942
Total revenue (TE) 1,024 1,115 2,085 2,197
Provision (credit) for loan and lease losses (8) 228 (48) 641
Depreciation and amortization expense 69 85 143 173
Other noninterest expense 611 684 1,238 1,381
Income (loss) from continuing operations before income taxes (TE) 352 118 752 2
Allocated income taxes and TE adjustments 100 17 218 (58)
Income (loss) from continuing operations 252 101 534 60
Income (loss) from discontinued operations, net of taxes (9) (27) (20) (25)
Net income (loss) 243 74 514 35
Less: Net income (loss) attributable to noncontrolling interests 3 4 11 20
Net income (loss) attributable to Key 240 70 503 15
AVERAGE BALANCES        
Loans and leases 48,454 54,953 48,881 56,282
Total assets 81,386 87,876 82,832 88,283
Deposits 58,541 64,409 59,286 64,882
OTHER FINANCIAL DATA        
Net loan charge-offs $ 134 $ 435 $ 327 $ 957
Return on average allocated equity 10.45% 3.65% 10.16% 0.75%
Return on average allocated equity, Total 10.07% 2.64% 9.77% 0.28%
Average full-time equivalent employees 15,349 15,665 15,326 15,718
[1] See Key's Consolidated Statements of Changes in Equity