XML 79 R53.htm IDEA: XBRL DOCUMENT
v3.25.2

LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Nonaccrual Loans) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | $ 33 | $ 112
Amortized cost basis with allowance | 275 | 185
Nonaccrual loans that are current | 308 | 297
Related allowance | 35 | 37
Commercial: |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 21 | 68
Amortized cost basis with allowance | 138 | 90
Nonaccrual loans that are current | 159 | 158
Related allowance | 18 | 23
Commercial: | Commercial and industrial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 10 | 45
Amortized cost basis with allowance | 103 | 69
Nonaccrual loans that are current | 113 | 114
Related allowance | 14 | 19
Commercial: | Owner-occupied |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 11 | 18
Amortized cost basis with allowance | 28 | 13
Nonaccrual loans that are current | 39 | 31
Related allowance | 2 | 1
Commercial: | Municipal |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 0 | 5
Amortized cost basis with allowance | 5 | 6
Nonaccrual loans that are current | 5 | 11
Related allowance | 2 | 2
Commercial: | Leasing |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 0 | 0
Amortized cost basis with allowance | 2 | 2
Nonaccrual loans that are current | 2 | 2
Related allowance | 0 | 1
Commercial real estate: |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 3 | 27
Amortized cost basis with allowance | 57 | 32
Nonaccrual loans that are current | 60 | 59
Related allowance | 3 | 4
Commercial real estate: | Term |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 3 | 27
Amortized cost basis with allowance | 57 | 32
Nonaccrual loans that are current | 60 | 59
Related allowance | 3 | 4
Consumer: |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 9 | 17
Amortized cost basis with allowance | 80 | 63
Nonaccrual loans that are current | 89 | 80
Related allowance | 14 | 10
Consumer: | 1-4 family residential |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 8 | 12
Amortized cost basis with allowance | 50 | 37
Nonaccrual loans that are current | 58 | 49
Related allowance | 5 | 4
Consumer: | Home equity credit line |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 1 | 5
Amortized cost basis with allowance | 29 | 25
Nonaccrual loans that are current | 30 | 30
Related allowance | 8 | 5
Consumer: | Bankcard and other revolving plans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Amortized cost basis with no allowance | 0 | 0
Amortized cost basis with allowance | 1 | 1
Nonaccrual loans that are current | 1 | 1
Related allowance | $ 1 | $ 1

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Excluding Accrued Interest, Nonaccrual, Related Allowance + References No definition available. + Details
Name: | zions_FinancingReceivableExcludingAccruedInterestNonaccrualRelatedAllowance
Namespace Prefix: | zions_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Excluding Accrued Interest, Nonaccrual, With Allowance + References No definition available. + Details
Name: | zions_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowance
Namespace Prefix: | zions_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=zions_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=zions_OwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=zions_MunicipalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=zions_TermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=zions_OneThroughFourFamilyResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=zions_BankcardAndOtherRevolvingPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |