v3.25.2
REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers $ 130 $ 126 $ 263 $ 251
Customer-related noninterest income from other sources 34 28 59 54
Total customer-related noninterest income 164 154 322 305
Noncustomer-related noninterest income 26 25 39 30
Total noninterest income 190 179 361 335
Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 46 45 91 89
Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 36 37 70 72
Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 18 16 35 33
Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 1 12 2
Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 13 13 27 27
Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 15 14 28 28
Other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 9 6 17 16
Customer-related noninterest income from other sources 2 4 6 10
Total customer-related noninterest income 11 10 23 26
Noncustomer-related noninterest income 19 15 28 16
Total noninterest income 30 25 51 42
Other | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers (1) (1) (1) 1
Other | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 0 0 0
Other | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 (1) 0
Other | Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 3 2
Other | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers (1) (1) 1 (1)
Other | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 9 7 15 14
Zions Bank | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 38 39 76 77
Customer-related noninterest income from other sources 10 6 14 10
Total customer-related noninterest income 48 45 90 87
Noncustomer-related noninterest income 1 2 1 3
Total noninterest income 49 47 91 90
Zions Bank | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 15 14 30 28
Zions Bank | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 12 13 24 25
Zions Bank | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 5 5 10 9
Zions Bank | Operating Segments | Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 0 0
Zions Bank | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 5 8 11
Zions Bank | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 4 4
CB&T | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 20 18 39 37
Customer-related noninterest income from other sources 11 10 18 16
Total customer-related noninterest income 31 28 57 53
Noncustomer-related noninterest income 1 2 3 3
Total noninterest income 32 30 60 56
CB&T | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 8 8 16 15
CB&T | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 5 4 9 10
CB&T | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 3 3 6 6
CB&T | Operating Segments | Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 0 1 0
CB&T | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 3 2
CB&T | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 4 4
Amegy | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 32 32 73 63
Customer-related noninterest income from other sources 8 7 14 15
Total customer-related noninterest income 40 39 87 78
Noncustomer-related noninterest income 3 3 5 5
Total noninterest income 43 42 92 83
Amegy | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 15 14 31 29
Amegy | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 7 8 15 15
Amegy | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 3 8 7
Amegy | Operating Segments | Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 8 0
Amegy | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 5 5 9 9
Amegy | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 2 2 3
NBAZ | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 10 10 19 20
Customer-related noninterest income from other sources 1 1 1 1
Total customer-related noninterest income 11 11 20 21
Noncustomer-related noninterest income (1) (1) (1) (1)
Total noninterest income 10 10 19 20
NBAZ | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 3 3 5 5
NBAZ | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 4 8 8
NBAZ | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 4 4
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 0
NBAZ | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 2 2
NBAZ | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 0 1
NSB | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 12 12 23 23
Customer-related noninterest income from other sources 1 0 2 1
Total customer-related noninterest income 13 12 25 24
Noncustomer-related noninterest income 0 4 0 4
Total noninterest income 13 16 25 28
NSB | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 3 4 6 7
NSB | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 4 8 8
NSB | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 3 2 6 5
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 0
NSB | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 3 3
NSB | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 0 0
Vectra | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 7 7 13 13
Customer-related noninterest income from other sources 1 0 3 0
Total customer-related noninterest income 8 7 16 13
Noncustomer-related noninterest income 3 0 3 0
Total noninterest income 11 7 19 13
Vectra | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 3 3
Vectra | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 3 5 5
Vectra | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 2 2
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 0
Vectra | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 0 1 1
Vectra | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 2 2
TCBW | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 3 2
Customer-related noninterest income from other sources 0 0 1 1
Total customer-related noninterest income 2 2 4 3
Noncustomer-related noninterest income 0 0 0 0
Total noninterest income 2 2 4 3
TCBW | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 1 1
TCBW | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 1 1
TCBW | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 0 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 0
TCBW | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 0 0
TCBW | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers $ 0 $ 0 $ 1 $ 0