Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Securities borrowed at fair value	$ 31,680	$ 26,279
Customer and other receivables at fair value	60	53
Trading assets, at fair value pledged as collateral	80,268	66,605
Investment at fair value	74,714	57,827
Investment at pledged collateral	14,244	10,968
Net allowance of loan	3,714	1,441
Loans receivable at fair value	13,881	14,386
Deposits at fair value	18,401	17,765
Securities loaned at fair value	1,060	714
Other secured financings at fair value	23,565	18,071
Unsecured short-term borrowings, including the current portion of unsecured long-term borrowings, at fair value	25,930	26,007
Unsecured long-term borrowings at fair value	40,328	43,661
Other liabilities and accrued expenses at fair value	336	150
Preferred stock, liquidation preference	$ 11,203	$ 11,203
Common stock, shares issued	901,631,819	896,782,650
Common stock, shares outstanding	344,070,790	347,343,184
Treasury stock, shares	557,561,031	549,439,468