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Significant Group Concentrations of Credit Risk Significant Group Concentrations of Credit Risk (Commercial Real Estate Exposure) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | $ 53,402 | $ 49,285
Real estate construction loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | 3,105 | 2,948
Commercial mortgage loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | 13,306 | 11,255
Total commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | 16,411 | 14,203
Total unused commitments |  | 6,602 | 4,030
Commercial Real Estate business line | Real estate construction loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | [1] | 2,505 | 2,391
Commercial Real Estate business line | Commercial mortgage loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | [1] | 4,681 | 3,338
Other Business Lines Member | Real estate construction loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | [2] | 600 | 557
Other Business Lines Member | Commercial mortgage loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | [2] | $ 8,625 | $ 7,917
[1] | Primarily loans to real estate developers.
[2] | Primarily loans secured by owner-occupied real estate.

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- Definition Reflects unused commitments that have been issued to businesses to acquire real property, develop land for sale or construction thereon, to construct a facility and to provide financing on existing land or a building, which, pursuant to terms of the underlying debt instrument, are secured at a minimum but possibly exclusively by that real property. + References No definition available. + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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