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Commitments, Guarantees and Contingencies - Narrative (Details) € in Millions, $ in Millions		1 Months Ended	9 Months Ended
	Aug. 13, 2021 USD ($)	Feb. 29, 2016 operator	Sep. 30, 2025 EUR (€) complaint	Sep. 30, 2025 USD ($)	Oct. 29, 2014 USD ($) certificate	May 17, 2013 USD ($)
Common Class B | Viacom
Loss Contingencies
Amount of stock offered	$ 1,700
Convertible Preferred Stock Subject to Mandatory Redemption | Viacom
Loss Contingencies
Amount of stock offered	$ 1,000
Dividend rate	5.75%
United States District Court for the Southern District of New York (“SDNY”) styled In Re: Interest Rate Swaps Antitrust Litigation | Pending Litigation
Loss Contingencies
Number of swap execution facilities | operator		3
City of Philadelphia, et al. v. Bank of America Corporation, et al. | Pending Litigation
Loss Contingencies
Number of antitrust class action complaints | complaint			3
Case Number 15/3637 and Case Number 15/4353 | Pending Litigation
Loss Contingencies
Withholding tax credit set-off			€ 124	$ 146
IKB International S.A. in Liquidation, et al. v. Morgan Stanley, et al. | Pending Litigation
Loss Contingencies
Value of mortgage pass-through certificates					$ 116	$ 133
Number of certificates dismissed | certificate					4

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