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Loans and Allowance for Credit Losses - Loan Modifications by Delinquency Status (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year $ 3,838 $ 3,019
Current    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 3,153 2,548
30-89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 148 124
30-89 Days Past Due | Loans purchased from GNMA mortgage pools    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 442 372
90 Days or More Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 537 347
90 Days or More Past Due | Loans purchased from GNMA mortgage pools    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 324 175
Commercial | Commercial    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 588 365
Commercial | Commercial | Current    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 395 255
Commercial | Commercial | 30-89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 26 12
Commercial | Commercial | 90 Days or More Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 167 98
Commercial | Commercial real estate    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 1,220 717
Commercial | Commercial real estate | Current    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 875 524
Commercial | Commercial real estate | 30-89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 26 0
Commercial | Commercial real estate | 90 Days or More Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 319 193
Consumer | Residential mortgages    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 1,479 1,425
Consumer | Residential mortgages | Current    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 1,469 1,385
Consumer | Residential mortgages | 30-89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 4 24
Consumer | Residential mortgages | 90 Days or More Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 6 16
Consumer | Credit card    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 414 350
Consumer | Credit card | Current    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 302 251
Consumer | Credit card | 30-89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 73 67
Consumer | Credit card | 90 Days or More Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 39 32
Consumer | Other retail    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 137 162
Consumer | Other retail | Current    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 112 133
Consumer | Other retail | 30-89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year 19 21
Consumer | Other retail | 90 Days or More Past Due    
Financing Receivable, Modified [Line Items]    
Loan balances modified during the year $ 6 $ 8