v3.26.1
Fair Value Measurement - Nonrecurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans $ 62,889   $ 62,889   $ 70,684
Equity securities adjusted based on the measurement alternative 8,191 $ 4,121 8,191 $ 4,121 $ 4,900
Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans 2,291 1,685 2,291 1,685  
Other assets 2,344 408 2,344 408  
Total assets measured at fair value 4,635 2,093 4,635 2,093  
Accounts payable and other liabilities 0 5 0 5  
Total liabilities measured at fair value 0 5 0 5  
Total nonrecurring fair value gains/(losses) 494 (123) 505 (130)  
Nonrecurring | Accounts payable and other liabilities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total nonrecurring fair value gains/(losses) 0 (4) 0 (5)  
Nonrecurring | Loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total nonrecurring fair value gains/(losses) (158) (105) (170) (139)  
Nonrecurring | Other assets          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total nonrecurring fair value gains/(losses) 652 (14) 675 14  
Nonrecurring | Other assets using measurement alternative          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total nonrecurring fair value gains/(losses) 651 (7) 664 26  
Nonrecurring | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans 0 0 0 0  
Other assets 0 0 0 0  
Total assets measured at fair value 0 0 0 0  
Accounts payable and other liabilities 0 0 0 0  
Total liabilities measured at fair value 0 0 0 0  
Nonrecurring | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans 860 1,048 860 1,048  
Other assets 8 10 8 10  
Total assets measured at fair value 868 1,058 868 1,058  
Accounts payable and other liabilities 0 0 0 0  
Total liabilities measured at fair value 0 0 0 0  
Nonrecurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans 1,431 637 1,431 637  
Other assets 2,336 398 2,336 398  
Total assets measured at fair value 3,767 1,035 3,767 1,035  
Accounts payable and other liabilities 0 5 0 5  
Total liabilities measured at fair value 0 $ 5 0 $ 5  
Equity securities adjusted based on the measurement alternative $ 2,300   $ 2,300