Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Securities purchased under agreements to resell and federal funds sold at fair value	$ 138,299	$ 139,220
Securities borrowed at fair value	30,003	23,142
Customer and other receivables at fair value	1,677	3,189
Financial instruments owned, at fair value pledged as collateral	71,561	55,081
Deposits at fair value	21,570	21,060
Securities loaned at fair value	2,622	3,241
Other secured financings at fair value	16,084	20,904
Unsecured short-term borrowings, including the current portion of unsecured long-term borrowings, at fair value	22,641	16,963
Unsecured long-term borrowings at fair value	47,047	46,584
Other liabilities and accrued expenses at fair value	204	132
Preferred stock, liquidation preference	$ 11,203	$ 11,203
Common stock, shares issued	896,762,705	891,356,284
Common stock, shares outstanding	357,509,026	367,741,973
Treasury stock, shares	539,253,681	523,614,313