Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
ASSETS
Cash and due from banks	$ 653		$ 617
Short-term investments	4,269		5,590
Trading account assets	750		738
Securities available for sale	13,360		12,346
Held-to-maturity securities (fair value: $4,974 and $4,617)	5,015		4,756
Other investments	760		969
Loans, net of unearned income of $682 and $805	57,381		54,457
Less: Allowance for loan and lease losses	794		848
Net loans	56,587		53,609
Loans held for sale	734		611
Premises and equipment	841		885
Operating lease assets	330		305
Goodwill	1,057		979
Other intangible assets	101		127
Corporate-owned life insurance	3,479		3,408
Derivative assets	609		407
Accrued income and other assets (including $1 of consolidated LIHTC guaranteed funds VIEs, see Note 11) (a)	2,952	[1]	3,015	[1]
Discontinued assets (including $191 of loans in portfolio at fair value)	2,324	[1]	4,572	[1]
Total assets	93,821		92,934
Deposits in domestic offices:
NOW and money market deposit accounts	34,536		33,952
Savings deposits	2,371		2,472
Certificates of deposit ($100,000 or more)	2,040		2,631
Other time deposits	3,259		3,648
Total interest-bearing deposits	42,206		42,703
Noninterest-bearing deposits	29,228		26,001
Deposits in foreign office - interest-bearing	564		558
Total deposits	71,998		69,262
Federal funds purchased and securities sold under repurchase agreements	575		1,534
Bank notes and other short-term borrowings	423		343
Derivative liabilities	784		414
Accrued expense and other liabilities	1,621		1,557
Long-term debt	7,875		7,650
Discontinued liabilities	3		1,854
Total liabilities	83,279		82,614
EQUITY
Common shares, $1 par value; authorized 1,400,000,000 shares; issued 1,016,969,905 and 1,016,969,905 shares	1,017		1,017
Capital surplus	3,986		4,022
Retained earnings	8,273		7,606
Treasury stock, at cost (157,566,493 and 126,245,538 shares)	(2,681)		(2,281)
Accumulated other comprehensive income (loss)	(356)		(352)
Key shareholders' equity	10,530		10,303
Noncontrolling interests	12		17
Total equity	10,542		10,320
Total liabilities and equity	93,821		92,934
Series A Preferred Stock [Member]
EQUITY
Preferred stock, $1 par value, authorized 25,000,000 shares: 7.75% Noncumulative Perpetual Convertible Preferred Stock, Series A, $100 liquidation preference; authorized 7,475,000 shares; issued 2,904,839 and 2,904,839 shares	$ 291		$ 291

[1] The assets of the VIEs can only be used by the particular VIE, and there is no recourse to Key with respect to the liabilities of the consolidated LIHTC VIEs.