v3.26.3
Fair Value Measurement - Nonrecurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans $ 71,658   $ 71,658   $ 70,684
Equity securities adjusted based on the measurement alternative 9,978 $ 4,808 9,978 $ 4,808 $ 4,900
Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans 1,875 847 1,875 847  
Other assets 3,236 818 3,236 818  
Total assets measured at fair value 5,111 1,665 5,111 1,665  
Accounts payable and other liabilities 26 5 26 5  
Total liabilities measured at fair value 26 5 26 5  
Total nonrecurring fair value gains/(losses) 72 (30) 611 (28)  
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) (26) 0 (26) (5)  
Nonrecurring | Loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total nonrecurring fair value gains/(losses) (76) (125) (215) (153)  
Nonrecurring | Other assets          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total nonrecurring fair value gains/(losses) 174 95 852 130  
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) 180 92 846 118  
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 1,142 389 1,142 389  
Other assets 8 53 8 53  
Total assets measured at fair value 1,150 442 1,150 442  
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 733 458 733 458  
Other assets 3,228 765 3,228 765  
Total assets measured at fair value 3,961 1,223 3,961 1,223  
Accounts payable and other liabilities 26 5 26 5  
Total liabilities measured at fair value 26 $ 5 26 $ 5  
Equity securities adjusted based on the measurement alternative $ 3,100   $ 3,100