Summary of Significant Accounting Policies - Prior Period Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Consolidated Balance Sheets
Cash	$ 11,452	$ 13,477
Restricted cash	31,131	25,059
Securities purchased under agreements to resell	45,650	56,250
Condensed Consolidated Statements of Cash Flows
Net change in securities purchased under agreements to resell	10,600	9,175	$ 3,990
Net cash provided by (used in) investing activities	186,904	152,245	119,275
Net increase (decrease) in cash and restricted cash	4,047	4,555	990
Cash and restricted cash at beginning of period	38,536	33,981	32,991
Cash and restricted cash at end of period	42,583	38,536	33,981
As Previously Reported
Condensed Consolidated Balance Sheets
Cash		38,853
Restricted cash		39,958
Securities purchased under agreements to resell		15,975
Condensed Consolidated Statements of Cash Flows
Net change in securities purchased under agreements to resell		14,725	(16,135)
Net cash provided by (used in) investing activities		157,795	99,150
Net increase (decrease) in cash and restricted cash		10,105	(19,135)
Cash and restricted cash at beginning of period	78,811	68,706	87,841
Cash and restricted cash at end of period		78,811	68,706
Adjustment for Change in Accounting Principle
Condensed Consolidated Balance Sheets
Cash		(25,376)
Restricted cash		(14,899)
Securities purchased under agreements to resell		40,275
Condensed Consolidated Statements of Cash Flows
Net change in securities purchased under agreements to resell		(5,550)	20,125
Net cash provided by (used in) investing activities		(5,550)	20,125
Net increase (decrease) in cash and restricted cash		(5,550)	20,125
Cash and restricted cash at beginning of period	$ (40,275)	(34,725)	(54,850)
Cash and restricted cash at end of period		$ (40,275)	$ (34,725)