Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets
Available-for-sale securities	$ 238,891	$ 241,754
At fair value	$ 2,230	$ 2,861
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
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)	543,744,003	441,459,392
Limited program wide credit enhancement	$ 2,400	$ 2,000
Loans reported as trading assets
Assets
Assets pledged	115,847	115,284
Securities
Assets
Assets pledged	16,115	14,883
Other assets
Assets
Assets pledged	1,603	1,286
Recurring
Assets
Federal funds sold and securities purchased under resale agreements	21,506	23,141
Securities borrowed	0	395
Available-for-sale securities	238,891	241,754
At fair value	2,230	2,861
Liabilities
Deposits	13,912	12,516
Federal funds purchased and securities loaned or sold under repurchase agreements	687	3,526
Other borrowed funds	9,105	9,911
Accounts payable and other liabilities	9,120	4,401
Beneficial interests issued by consolidated VIEs	120	787
Long-term debt	37,686	33,065
Recurring | Other assets
Assets
Other assets at fair value	$ 7,557	$ 7,604