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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | $ 1,302 | $ 1,316 |
Noninterest income | 2,459 | 2,515 | $ 2,478
Contract assets | 0 | 0 |
Contract liabilities | 0 | 0 |
Trust And Investment Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 419 | 426 |
Investment Banking And Debt Placement [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 263 | 260 |
Service Charges On Deposit Accounts [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 337 | 349 |
Cards And Payments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 270 | 263 |
Other Noninterest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 13 | 18 |
Noninterest income | 1,010 | 927 |
Operating Segments [Member] | Key Community Bank [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 760 | 763 |
Operating Segments [Member] | Key Community Bank [Member] | Trust And Investment Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 355 | 352 |
Operating Segments [Member] | Key Community Bank [Member] | Investment Banking And Debt Placement [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 |
Operating Segments [Member] | Key Community Bank [Member] | Service Charges On Deposit Accounts [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 228 | 239 |
Operating Segments [Member] | Key Community Bank [Member] | Cards And Payments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 164 | 155 |
Operating Segments [Member] | Key Community Bank [Member] | Other Noninterest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 13 | 17 |
Operating Segments [Member] | Key Corporate Bank [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 542 | 553 |
Operating Segments [Member] | Key Corporate Bank [Member] | Trust And Investment Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 64 | 74 |
Operating Segments [Member] | Key Corporate Bank [Member] | Investment Banking And Debt Placement [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 263 | 260 |
Operating Segments [Member] | Key Corporate Bank [Member] | Service Charges On Deposit Accounts [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 109 | 110 |
Operating Segments [Member] | Key Corporate Bank [Member] | Cards And Payments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 106 | 108 |
Operating Segments [Member] | Key Corporate Bank [Member] | Other Noninterest Income [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 1 |
Corporate And Reconciling Items [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Noninterest income | $ 147 | $ 272 | $ 230

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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