Fair Value Measurement - Nonrecurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 70,684	$ 41,350
Equity securities without readily determinable fair values	4,873	3,737
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	1,147	1,432
Other assets	871	1,057
Total assets measured at fair value	2,018	2,489
Accounts payable and other liabilities	5	0
Total liabilities measured at fair value	5	0
Total nonrecurring fair value gains/(losses)	(55)	(912)	$ (1,065)
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)	(5)	0	0
Nonrecurring | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nonrecurring fair value gains/(losses)	(151)	(302)	(276)
Nonrecurring | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nonrecurring fair value gains/(losses)	101	(610)	(789)
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)	122	(197)	$ (232)
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Other assets	0	0
Total assets measured at fair value	0	0
Accounts payable and other liabilities	0	0
Total liabilities measured at fair value	0	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	618	738
Other assets	8	9
Total assets measured at fair value	626	747
Accounts payable and other liabilities	0	0
Total liabilities measured at fair value	0	0
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	529	694
Other assets	863	1,048
Total assets measured at fair value	1,392	1,742
Accounts payable and other liabilities	5	0
Total liabilities measured at fair value	5	$ 0
Equity securities without readily determinable fair values	$ 721