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Loans, Leases, and Allowance for Credit Losses (Summary of Selected Information on TDRs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 264 $ 235
Percentage of total loans 3 0.50%  
Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   197
Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   38
Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 4  
Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 256  
Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1 7
Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   6
Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 2 32
Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   29
Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1 3
Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1 74
Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   65
Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   9
Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   8
Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   4
Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   4
Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   53
Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   42
Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   11
Other    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   61
Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   51
Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   10
Commercial    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 69  
Percentage of total loans 3 0.20%  
Commercial | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   78
Commercial | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   23
Commercial | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 4  
Commercial | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 63  
Commercial | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 2  
Commercial | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Commercial | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   3
Commercial | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   40
Commercial | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   7
Commercial | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Commercial | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   4
Commercial | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   13
Commercial | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   22
Commercial | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   9
Commercial | Commercial and industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 47  
Percentage of total loans 3 0.30%  
Commercial | Commercial and industrial | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   50
Commercial | Commercial and industrial | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   15
Commercial | Commercial and industrial | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Commercial | Commercial and industrial | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 46  
Commercial | Commercial and industrial | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Commercial and industrial | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Commercial and industrial | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Commercial and industrial | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Commercial | Commercial and industrial | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Commercial and industrial | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   3
Commercial | Commercial and industrial | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Commercial and industrial | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   28
Commercial | Commercial and industrial | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   3
Commercial | Commercial and industrial | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Commercial | Commercial and industrial | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Commercial and industrial | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   12
Commercial | Commercial and industrial | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Commercial and industrial | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   9
Commercial | Commercial and industrial | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   9
Commercial | Owner-occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 14  
Percentage of total loans 3 0.20%  
Commercial | Owner-occupied | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   28
Commercial | Owner-occupied | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   8
Commercial | Owner-occupied | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 4  
Commercial | Owner-occupied | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 9  
Commercial | Owner-occupied | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Owner-occupied | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Owner-occupied | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Owner-occupied | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Commercial | Owner-occupied | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Commercial | Owner-occupied | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Owner-occupied | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Owner-occupied | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   12
Commercial | Owner-occupied | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   4
Commercial | Owner-occupied | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Owner-occupied | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   4
Commercial | Owner-occupied | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Commercial | Owner-occupied | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Owner-occupied | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   13
Commercial | Owner-occupied | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial | Municipal    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 8  
Percentage of total loans 3 0.20%  
Commercial | Municipal | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Commercial | Municipal | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 8  
Commercial | Municipal | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Municipal | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial | Municipal | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 192  
Percentage of total loans 3 1.40%  
Commercial real estate | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   92
Commercial real estate | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   10
Commercial real estate | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Commercial real estate | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 192  
Commercial real estate | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   27
Commercial real estate | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   9
Commercial real estate | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Commercial real estate | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   27
Commercial real estate | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   10
Commercial real estate | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   28
Commercial real estate | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Construction and land development    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 27  
Percentage of total loans 3 1.00%  
Commercial real estate | Construction and land development | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   8
Commercial real estate | Construction and land development | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Commercial real estate | Construction and land development | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 27  
Commercial real estate | Construction and land development | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Construction and land development | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Construction and land development | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Construction and land development | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Construction and land development | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Construction and land development | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   8
Commercial real estate | Construction and land development | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Construction and land development | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Construction and land development | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Term    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 165  
Percentage of total loans 3 1.50%  
Commercial real estate | Term | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   84
Commercial real estate | Term | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   10
Commercial real estate | Term | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Commercial real estate | Term | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 165  
Commercial real estate | Term | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Term | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Term | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Term | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Term | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   27
Commercial real estate | Term | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Term | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Commercial real estate | Term | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Commercial real estate | Term | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Term | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Commercial real estate | Term | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Commercial real estate | Term | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   27
Commercial real estate | Term | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   10
Commercial real estate | Term | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   28
Commercial real estate | Term | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 3  
Percentage of total loans 3 0.00%  
Consumer | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   27
Consumer | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   5
Consumer | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Consumer | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Consumer | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Consumer | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   6
Consumer | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Consumer | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Consumer | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   16
Consumer | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Consumer | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Consumer | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Consumer | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | 1-4 family residential    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 2  
Percentage of total loans 3 0.00%  
Consumer | 1-4 family residential | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   21
Consumer | 1-4 family residential | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   4
Consumer | 1-4 family residential | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Consumer | 1-4 family residential | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Consumer | 1-4 family residential | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Consumer | 1-4 family residential | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Consumer | 1-4 family residential | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | 1-4 family residential | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Consumer | 1-4 family residential | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | 1-4 family residential | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | 1-4 family residential | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Consumer | 1-4 family residential | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   15
Consumer | 1-4 family residential | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Consumer | 1-4 family residential | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   2
Consumer | 1-4 family residential | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | 1-4 family residential | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | 1-4 family residential | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | 1-4 family residential | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | 1-4 family residential | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Bankcard and other revolving plans    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 1  
Percentage of total loans 3 0.20%  
Consumer | Bankcard and other revolving plans | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Consumer | Bankcard and other revolving plans | Maturity or term extension    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 1  
Consumer | Bankcard and other revolving plans | Principal forgiveness    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Consumer | Bankcard and other revolving plans | Payment deferral    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market 0  
Consumer | Bankcard and other revolving plans | Multiple modification types    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market $ 0  
Consumer | Home equity credit line | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   6
Consumer | Home equity credit line | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Home equity credit line | Principal forgiveness | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   4
Consumer | Home equity credit line | Principal forgiveness | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Home equity credit line | Payment deferral | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Home equity credit line | Payment deferral | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Home equity credit line | Multiple modification types | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Home equity credit line | Multiple modification types | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Home equity credit line | Interest rate reduction | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Home equity credit line | Interest rate reduction | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Home equity credit line | Maturity or term extension | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   1
Consumer | Home equity credit line | Maturity or term extension | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Home equity credit line | Other | Accruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   0
Consumer | Home equity credit line | Other | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Recorded investment in TDR loans modified with interest rates below market   $ 0