Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Assets pledged	$ 219,100	$ 166,600
Available-for-sale securities, amortized cost	378,756	381,729
Held-to-maturity securities, allowance for credit losses	94	78
Loans	$ 50,767	$ 44,474
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	200,000,000	200,000,000
Preferred stock, shares issued (in shares)	3,156,250	3,006,250
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	9,000,000,000	9,000,000,000
Common stock, shares issued (in shares)	4,104,933,895	4,104,933,895
Treasury stock, at cost (in shares)	1,077,805,783	1,055,499,435
Trading assets
Assets
Assets pledged	$ 117,020	$ 130,645
Investment securities - AFS
Assets
Assets pledged	64,540	32,227
Other assets
Assets
Assets pledged	37,581	3,739
Recurring
Assets
Federal funds sold and securities purchased under resale agreements	267,613	238,015
Securities borrowed	66,277	52,983
Loans	50,767	44,474
Liabilities
Deposits	14,107	14,484
Federal funds purchased and securities loaned or sold under repurchase agreements	197,834	155,735
Short-term borrowings	20,002	16,893
Accounts payable and other liabilities	42,824	3,476
Beneficial interests issued by consolidated VIEs	193	41
Long-term debt	75,693	76,817
Recurring | Other assets
Assets
Other assets	$ 50,492	$ 13,827