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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers $ 133 $ 128 $ 396 $ 378
Customer-related noninterest income from other sources 30 33 89 88
Total customer-related noninterest income 163 161 485 466
Noncustomer-related noninterest income 26 11 65 41
Total noninterest income 189 172 550 507
Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 47 46 138 135
Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 35 36 105 108
Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 19 17 54 50
Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 2 16 4
Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 13 13 40 40
Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 15 14 43 41
Other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 9 8 27 24
Customer-related noninterest income from other sources (7) 4 (1) 16
Total customer-related noninterest income 2 12 26 40
Noncustomer-related noninterest income 22 7 49 19
Total noninterest income 24 19 75 59
Other | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 (1) 0 1
Other | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 2 1
Other | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers (1) (1) (1) 1
Other | Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 4 4
Other | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers (2) (1) 2 0
Other | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 9 8 20 17
Zions Bank | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 39 39 116 117
Customer-related noninterest income from other sources 10 7 23 16
Total customer-related noninterest income 49 46 139 133
Noncustomer-related noninterest income 0 0 2 3
Total noninterest income 49 46 141 136
Zions Bank | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 15 15 45 42
Zions Bank | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 12 12 37 38
Zions Bank | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 6 5 16 14
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 12 16
Zions Bank | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 6 7
CB&T | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 21 19 59 55
Customer-related noninterest income from other sources 9 10 28 26
Total customer-related noninterest income 30 29 87 81
Noncustomer-related noninterest income 1 2 4 6
Total noninterest income 31 31 91 87
CB&T | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 8 8 24 23
CB&T | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 5 13 14
CB&T | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 3 10 9
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 2 0
CB&T | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 1 4 3
CB&T | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 6 6
Amegy | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 33 32 105 95
Customer-related noninterest income from other sources 13 10 27 25
Total customer-related noninterest income 46 42 132 120
Noncustomer-related noninterest income 3 2 8 8
Total noninterest income 49 44 140 128
Amegy | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 15 15 46 44
Amegy | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 8 8 22 23
Amegy | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 4 11 10
Amegy | Operating Segments | Capital markets fees and income        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 9 0
Amegy | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 5 4 13 13
Amegy | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 4 5
NBAZ | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 10 10 29 29
Customer-related noninterest income from other sources 2 1 3 2
Total customer-related noninterest income 12 11 32 31
Noncustomer-related noninterest income 0 0 (1) 0
Total noninterest income 12 11 31 31
NBAZ | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 3 3 7 8
NBAZ | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 4 11 11
NBAZ | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 7 6
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 3 3
NBAZ | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 1 1
NSB | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 12 12 35 34
Customer-related noninterest income from other sources 1 0 3 1
Total customer-related noninterest income 13 12 38 35
Noncustomer-related noninterest income 0 0 0 5
Total noninterest income 13 12 38 40
NSB | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 3 3 9 10
NSB | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 4 4 12 12
NSB | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 3 3 8 7
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 5 4
NSB | Operating Segments | Other customer-related fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 1 1
Vectra | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 8 7 21 20
Customer-related noninterest income from other sources 1 0 4 0
Total customer-related noninterest income 9 7 25 20
Noncustomer-related noninterest income 0 0 3 0
Total noninterest income 9 7 28 20
Vectra | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 5 5
Vectra | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 2 2 7 8
Vectra | Operating Segments | Retail and business banking fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 3 3
Vectra | 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
Vectra | Operating Segments | Wealth management fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 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 4 3
TCBW | Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 4 4
Customer-related noninterest income from other sources 1 1 2 2
Total customer-related noninterest income 2 2 6 6
Noncustomer-related noninterest income 0 0 0 0
Total noninterest income 2 2 6 6
TCBW | Operating Segments | Commercial account fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 1 1 2 2
TCBW | Operating Segments | Card fees        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total noninterest income from contracts with customers 0 0 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 $ 1