Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities purchased under agreements to resell and federal funds sold at fair value	$ 116,546	$ 116,077
Securities borrowed at fair value	79,893	82,398
Receivables from customers and counterparties at fair value	3,644	3,266
Financial instruments owned, at fair value pledged as collateral	53,389	51,278
Deposits at fair value	19,480	13,782
Securities loaned at fair value	4,403	2,647
Other secured financings at fair value	21,960	21,073
Unsecured short-term borrowings, including the current portion of unsecured long-term borrowings, at fair value	13,900	14,792
Unsecured long-term borrowings at fair value	32,075	29,410
Other liabilities and accrued expenses at fair value	$ 806	$ 621
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 11,203	$ 11,203
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	4,000,000,000	4,000,000,000
Common stock, shares issued	881,753,381	873,608,100
Common stock, shares outstanding	394,791,563	392,632,230
Nonvoting common stock, par value	$ 0.01	$ 0.01
Nonvoting common stock, shares authorized	200,000,000	200,000,000
Treasury stock, par value	$ 0.01	$ 0.01
Treasury stock, shares	486,961,820	480,975,872