Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Securities segregated for regulatory and other purposes	$ 36,058	$ 38,504
Securities purchased under agreements to resell and federal funds sold at fair value	93,352	119,450
Securities borrowed at fair value	78,788	69,801
Receivables from customers and counterparties at fair value	3,297	4,992
Financial instruments owned, at fair value pledged as collateral	55,800	54,426
Deposits at fair value	14,096	14,680
Securities loaned at fair value	1,969	466
Other secured financings at fair value	22,006	23,207
Unsecured short-term borrowings, including the current portion of unsecured long-term borrowings, at fair value	16,741	17,743
Unsecured long-term borrowings at fair value	30,266	22,273
Other liabilities and accrued expenses at fair value	$ 665	$ 1,253
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 11,203	$ 11,200
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	4,000,000,000	4,000,000,000
Common stock, shares issued	872,612,590	863,976,731
Common stock, shares outstanding	399,211,902	419,480,736
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	473,400,690	444,495,997