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Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
SecurityLoan
Dec. 31, 2012
SecurityLoan
Jun. 30, 2012
SecurityLoan
Financing Receivable, Modifications [Line Items]      
Number of loans 4,507 3,657 1,094
Pre-modification Outstanding Recorded Investment $ 418 $ 434 $ 399
Post-modification Outstanding Recorded Investment 311 320 274
Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 3,358 3,094 463
Pre-modification Outstanding Recorded Investment 298 350 247
Post-modification Outstanding Recorded Investment 195 249 163
Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 1,149 563 631
Pre-modification Outstanding Recorded Investment 120 84 152
Post-modification Outstanding Recorded Investment 116 71 111
Commercial, Financial and Agricultural [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 43 82 95
Pre-modification Outstanding Recorded Investment 53 76 108
Post-modification Outstanding Recorded Investment 24 39 59
Commercial, Financial and Agricultural [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 87 122 115
Pre-modification Outstanding Recorded Investment 10 12 8
Post-modification Outstanding Recorded Investment 5 6 6
Commercial Real Estate: Commercial Mortgage [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 15 15 16
Pre-modification Outstanding Recorded Investment 58 62 47
Post-modification Outstanding Recorded Investment 21 25 31
Commercial Real Estate: Commercial Mortgage [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 4 4 7
Pre-modification Outstanding Recorded Investment 22 22 71
Post-modification Outstanding Recorded Investment 15 15 48
Commercial Real Estate: Construction [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 6 8 11
Pre-modification Outstanding Recorded Investment 19 53 60
Post-modification Outstanding Recorded Investment 5 33 43
Commercial Real Estate: Construction [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 1   1
Pre-modification Outstanding Recorded Investment 23   15
Post-modification Outstanding Recorded Investment 32   1
Commercial Real Estate Loans [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 21 23 27
Pre-modification Outstanding Recorded Investment 77 115 107
Post-modification Outstanding Recorded Investment 26 58 74
Commercial Real Estate Loans [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 5 4 8
Pre-modification Outstanding Recorded Investment 45 22 86
Post-modification Outstanding Recorded Investment 47 15 49
Commercial Loans [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 64 105 122
Pre-modification Outstanding Recorded Investment 130 191 215
Post-modification Outstanding Recorded Investment 50 97 133
Commercial Loans [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 92 126 123
Pre-modification Outstanding Recorded Investment 55 34 94
Post-modification Outstanding Recorded Investment 52 21 55
Real Estate - Residential Mortgage [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 381 372 56
Pre-modification Outstanding Recorded Investment 23 28 7
Post-modification Outstanding Recorded Investment 23 28 7
Real Estate - Residential Mortgage [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 118 101 111
Pre-modification Outstanding Recorded Investment 12 10 11
Post-modification Outstanding Recorded Investment 12 10 11
Home Equity: Key Community Bank [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 1,683 1,577 50
Pre-modification Outstanding Recorded Investment 89 87 4
Post-modification Outstanding Recorded Investment 87 82 4
Home Equity: Key Community Bank [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 134 76 88
Pre-modification Outstanding Recorded Investment 14 5 7
Post-modification Outstanding Recorded Investment 14 5 7
Home Equity: Other [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 262 322 74
Pre-modification Outstanding Recorded Investment 8 9 2
Post-modification Outstanding Recorded Investment 8 8 1
Home Equity: Other [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 178 84 101
Pre-modification Outstanding Recorded Investment 5 3 3
Post-modification Outstanding Recorded Investment 5 3 3
Home Equity Loans [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 1,945 1,899 124
Pre-modification Outstanding Recorded Investment 97 96 6
Post-modification Outstanding Recorded Investment 95 90 5
Home Equity Loans [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 312 160 189
Pre-modification Outstanding Recorded Investment 19 8 10
Post-modification Outstanding Recorded Investment 19 8 10
Consumer Other - Key Community Bank [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 54 28 11
Pre-modification Outstanding Recorded Investment 2 1 1
Post-modification Outstanding Recorded Investment 2 1 1
Consumer Other - Key Community Bank [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 26 16 20
Pre-modification Outstanding Recorded Investment 1   1
Post-modification Outstanding Recorded Investment 1    
Credit Cards [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 506 405  
Pre-modification Outstanding Recorded Investment 3 3  
Post-modification Outstanding Recorded Investment 3 3  
Credit Cards [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 309    
Pre-modification Outstanding Recorded Investment 2    
Post-modification Outstanding Recorded Investment 2    
Consumer Marine [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 360 251 139
Pre-modification Outstanding Recorded Investment 41 30 17
Post-modification Outstanding Recorded Investment 21 29 17
Consumer Marine [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 243 117 135
Pre-modification Outstanding Recorded Investment 29 31 34
Post-modification Outstanding Recorded Investment 28 31 33
Other Consumer [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 48 34 11
Pre-modification Outstanding Recorded Investment 2 1 1
Post-modification Outstanding Recorded Investment 1 1  
Other Consumer [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 49 43 53
Pre-modification Outstanding Recorded Investment 2 1 2
Post-modification Outstanding Recorded Investment 2 1 2
Consumer Other [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 408 285 150
Pre-modification Outstanding Recorded Investment 43 31 18
Post-modification Outstanding Recorded Investment 22 30 17
Consumer Other [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 292 160 188
Pre-modification Outstanding Recorded Investment 31 32 36
Post-modification Outstanding Recorded Investment 30 32 35
Consumer Loans [Member] | Nonperforming [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 3,294 2,989 341
Pre-modification Outstanding Recorded Investment 168 159 32
Post-modification Outstanding Recorded Investment 145 152 30
Consumer Loans [Member] | Prior-Year Accruing [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of loans 1,057 437 508
Pre-modification Outstanding Recorded Investment 65 50 58
Post-modification Outstanding Recorded Investment $ 64 $ 50 $ 56