v3.25.4
Fair Value Measurements, Gains (Losses) on Changes in Fair Value Included in Earnings (Details) - Fair value option election [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Trading Asset [Member] | Mortgage banking noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) $ 0 $ 0 $ 0
Trading Asset [Member] | Net gains from trading and securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 12 35 46
Trading Asset [Member] | Other noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 (26)
Other assets [Member] | Mortgage banking noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 88 106 230
Other assets [Member] | Net gains from trading and securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 0
Other assets [Member] | Other noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 0
Interest-bearing deposits [Member] | Mortgage banking noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 0
Interest-bearing deposits [Member] | Net gains from trading and securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 (2) (22)
Interest-bearing deposits [Member] | Other noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 0
Other liabilities [Member] | Mortgage banking noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 0
Other liabilities [Member] | Net gains from trading and securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 0
Other liabilities [Member] | Other noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) (45) (47) (38)
Long-term debt [Member] | Mortgage banking noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 0 0 0
Long-term debt [Member] | Net gains from trading and securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) 15 86 (81)
Long-term debt [Member] | Other noninterest income [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value option, changes in fair value, gain (loss) $ 0 $ 0 $ 0