v3.26.1
Fair Value Measurements, Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value measurement, nonrecurring, fair value measurement date is different than period end date [true false] true true
Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale $ 608 $ 2,086
Loans 484 1,257
Equity securities 3,432 2,792
Other assets 47 98
Total assets measured at fair value on a recurring basis 4,571 6,233
Nonrecurring [Member] | Total Commercial [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 417 1,161
Nonrecurring [Member] | Total Consumer [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 67 96
Nonrecurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale 599 1,846
Loans 484 1,257
Equity securities 652 1,001
Other assets 46 89
Total assets measured at fair value on a recurring basis 1,781 4,193
Nonrecurring [Member] | Level 2 [Member] | Total Commercial [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 417 1,161
Nonrecurring [Member] | Level 2 [Member] | Total Consumer [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 67 96
Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale 9 240
Loans 0 0
Equity securities 2,780 1,791
Other assets 1 9
Total assets measured at fair value on a recurring basis 2,790 2,040
Nonrecurring [Member] | Level 3 [Member] | Total Commercial [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans 0 0
Nonrecurring [Member] | Level 3 [Member] | Total Consumer [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans $ 0 $ 0