Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Securities purchased under agreements to resell and federal funds sold at fair value	$ 85,691	$ 139,220
Securities borrowed at fair value	26,279	23,142
Customer and other receivables at fair value	53	160
Trading assets, at fair value pledged as collateral	66,605	47,371
Investment at fair value	57,827	45,579
Investment at pledged collateral	10,968	7,710
Loans receivable at fair value	14,386	13,416
Deposits at fair value	17,765	21,060
Securities loaned at fair value	714	3,241
Other secured financings at fair value	18,071	20,904
Unsecured short-term borrowings, including the current portion of unsecured long-term borrowings, at fair value	26,007	16,963
Unsecured long-term borrowings at fair value	43,661	46,584
Other liabilities and accrued expenses at fair value	150	132
Preferred stock, liquidation preference	$ 11,203	$ 11,203
Common stock, shares issued	896,782,650	891,356,284
Common stock, shares outstanding	347,343,184	367,741,973
Treasury stock, shares	549,439,468	523,614,313