CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Securities borrowed or purchased under agreements to resell, at fair value	$ 337,696	$ 294,712
Trading account assets, pledged to creditors	142,662	168,967
Available-for-sale securities, pledged to creditors	8,685	5,921
Held-to-maturity securities, pledged to creditors	1,257	547
Equity securities, at fair value	918	1,066
Loans, net of unearned income, at fair value	664,764	675,883
Mortgage servicing rights, at fair value	409	336
Other assets, at fair value	123,947	110,683
Interest-bearing deposits in U.S. offices, at fair value	567,902	503,213
Interest-bearing deposits in offices outside the U.S., at fair value	540,507	549,973
Securities loaned or sold under agreements to repurchase, at fair value	209,184	199,525
Brokerage payables, at fair value	60,501	50,484
Short-term borrowings, at fair value	29,683	29,514
Long-term debt, at fair value	$ 258,274	$ 271,686
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, authorized shares (in shares)	30,000,000	30,000,000
Preferred stock, issued shares, at aggregate liquidation value (in shares)	719,800	779,200
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	6,000,000,000	6,000,000,000
Common stock, issued shares (in shares)	3,099,651,835	3,099,763,661
Treasury stock (in shares)	1,115,384,596	1,017,674,452
Consumer
Loans, net of unearned income, at fair value	$ 264,250	$ 288,839
Corporate
Loans, net of unearned income, at fair value	400,514	387,044
Fair value
Securities borrowed or purchased under agreements to resell, at fair value	212,200	185,204
Other assets, at fair value	11,895	14,613
Interest-bearing deposits in U.S. offices, at fair value	910	879
Interest-bearing deposits in offices outside the U.S., at fair value	1,803	1,079
Securities loaned or sold under agreements to repurchase, at fair value	75,262	60,206
Brokerage payables, at fair value	3,423	6,835
Short-term borrowings, at fair value	8,814	4,683
Long-term debt, at fair value	78,178	67,063
Fair value | Consumer
Loans, net of unearned income, at fair value	13	14
Fair value | Corporate
Loans, net of unearned income, at fair value	$ 7,146	$ 6,840