Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Assets
Available-for-sale securities	$ 237,391	$ 241,754
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	200,000,000	200,000,000
Preferred stock, shares issued (in shares)	2,606,750	2,606,750
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
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
Shares held in Trust, shares (in shares)	472,953	472,953
Treasury stock, shares (in shares)	448,274,970	441,459,392
Limited program wide credit enhancement	$ 2,000	$ 2,000
Loans reported as trading assets
Assets
Assets pledged	109,152	115,284
Securities
Assets
Assets pledged	20,028	14,883
Other assets
Assets
Assets pledged	1,329	1,286
Other assets
Assets
Other assets at fair value	6,555	6,447
Recurring
Assets
Federal funds sold and securities purchased under resale agreements	24,122	23,141
Securities borrowed	0	395
Available-for-sale securities	237,391	241,754
Loans	1,923	2,861
Liabilities
Deposits	12,019	12,516
Federal funds purchased and securities loaned or sold under repurchase agreements	3,429	3,526
Other borrowed funds	9,635	9,911
Accounts payable and other liabilities	4,599	4,401
Beneficial interests issued by consolidated VIEs	670	787
Long-term debt	35,215	33,065
Recurring | Other assets
Assets
Other assets at fair value	$ 7,520	$ 7,604