v3.25.4
REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 $ 529 $ 513 $ 503
Customer-related noninterest income from other sources                 133 126 113
Total customer-related noninterest income                 662 639 616
Noncustomer-related noninterest income                 96 61 61
Noninterest income $ 208 $ 189 $ 190 $ 171 $ 193 $ 172 $ 179 $ 156 758 700 677
Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 185 182 174
Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 139 144 146
Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 74 67 66
Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 19 11 4
Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 54 54 53
Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 58 55 60
Other                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 35 33 34
Customer-related noninterest income from other sources                 6 19 14
Total customer-related noninterest income                 41 52 48
Noncustomer-related noninterest income                 72 33 17
Noninterest income                 113 85 65
Other | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 1 2 0
Other | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 1 0
Other | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 0 0
Other | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 7 6 4
Other | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 1 0 (1)
Other | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 26 24 31
Zions Bank | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 155 157 157
Customer-related noninterest income from other sources                 33 24 24
Total customer-related noninterest income                 188 181 181
Noncustomer-related noninterest income                 2 6 11
Noninterest income                 190 187 192
Zions Bank | Operating Segments | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 60 57 55
Zions Bank | Operating Segments | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 49 50 52
Zions Bank | Operating Segments | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 21 19 19
Zions Bank | Operating Segments | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 1 1 0
Zions Bank | Operating Segments | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 16 21 23
Zions Bank | Operating Segments | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 8 9 8
CB&T | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 81 74 75
Customer-related noninterest income from other sources                 38 39 35
Total customer-related noninterest income                 119 113 110
Noncustomer-related noninterest income                 7 8 6
Noninterest income                 126 121 116
CB&T | Operating Segments | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 32 31 32
CB&T | Operating Segments | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 18 19 21
CB&T | Operating Segments | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 13 11 11
CB&T | Operating Segments | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 2 1 0
CB&T | Operating Segments | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 6 4 4
CB&T | Operating Segments | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 10 8 7
Amegy | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 138 131 125
Customer-related noninterest income from other sources                 39 34 37
Total customer-related noninterest income                 177 165 162
Noncustomer-related noninterest income                 12 10 22
Noninterest income                 189 175 184
Amegy | Operating Segments | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 61 59 56
Amegy | Operating Segments | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 29 31 31
Amegy | Operating Segments | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 16 14 14
Amegy | Operating Segments | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 9 3 0
Amegy | Operating Segments | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 18 18 17
Amegy | Operating Segments | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 5 6 7
NBAZ | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 40 39 37
Customer-related noninterest income from other sources                 5 4 2
Total customer-related noninterest income                 45 43 39
Noncustomer-related noninterest income                 (1) 0 1
Noninterest income                 44 43 40
NBAZ | Operating Segments | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 10 11 10
NBAZ | Operating Segments | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 16 15 15
NBAZ | Operating Segments | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 9 9 8
NBAZ | Operating Segments | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 0 0
NBAZ | Operating Segments | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 4 3 3
NBAZ | Operating Segments | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 1 1 1
NSB | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 46 46 44
Customer-related noninterest income from other sources                 5 2 1
Total customer-related noninterest income                 51 48 45
Noncustomer-related noninterest income                 1 4 0
Noninterest income                 52 52 45
NSB | Operating Segments | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 12 13 12
NSB | Operating Segments | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 16 16 16
NSB | Operating Segments | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 11 10 10
NSB | Operating Segments | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 0 0
NSB | Operating Segments | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 7 6 5
NSB | Operating Segments | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 1 1
Vectra | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 28 27 25
Customer-related noninterest income from other sources                 5 2 3
Total customer-related noninterest income                 33 29 28
Noncustomer-related noninterest income                 3 0 0
Noninterest income                 36 29 28
Vectra | Operating Segments | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 7 7 7
Vectra | Operating Segments | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 9 10 9
Vectra | Operating Segments | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 4 3 4
Vectra | Operating Segments | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 0 0
Vectra | Operating Segments | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 2 2 1
Vectra | Operating Segments | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 6 5 4
TCBW | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 6 6 6
Customer-related noninterest income from other sources                 2 2 1
Total customer-related noninterest income                 8 8 7
Noncustomer-related noninterest income                 0 0 0
Noninterest income                 8 8 7
TCBW | Operating Segments | Commercial account fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 2 2 2
TCBW | Operating Segments | Card fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 2 2 2
TCBW | Operating Segments | Retail and business banking fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 1 0
TCBW | Operating Segments | Capital markets fees and income                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 0 0
TCBW | Operating Segments | Wealth management fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 0 0 1
TCBW | Operating Segments | Other customer-related fees                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total noninterest income from contracts with customers                 $ 2 $ 1 $ 1