CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012 Variable Interest Entities	Dec. 31, 2011 Variable Interest Entities	Dec. 31, 2012 Preferred Stock	Dec. 31, 2011 Preferred Stock	Dec. 31, 2012 Preferred stock Series G	Dec. 31, 2011 Preferred stock Series G
Cash and due from banks	$ 2,441	[1]	$ 2,663	[1]	$ 0	$ 30
Other short-term investments	2,421	[1]	1,781	[1]	0	7
Commercial mortgage loans	9,103	[1]	10,138	[1]	50	50
Home equity	10,018	[1]	10,719	[1]	0	223
Automobile loans	11,972	[1]	11,827	[1]	0	259
Allowance for loan and lease losses	(1,854)	[1]	(2,255)	[1]	(5)	(10)
Other assets	8,204	[1]	8,863	[1]	3	4
Other liabilities	2,639	[1]	3,270	[1]	0	4
Long-term debt	7,085	[1]	9,682	[1]	0	191
Available-for-sale and other securities, amortized cost	14,571		14,614
Held-to-maturity securities, fair value	284		322
Residential mortgage loans held for sale	2,856		2,751
Residential mortgage loans measured at fair value	$ 76		$ 65
Common stock, stated value	$ 2.22		$ 2.22
Common stock, authorized	2,000,000,000		2,000,000,000
Common stock, outstanding	882,152,057		919,804,436
Common stock, treasury shares	41,740,524		4,088,145
Preferred stock, Convertible									2,159.8272	2,159.8272
Preferred stock, liquidation preference									$ 25,000	$ 25,000
Preferred stock, authorized							317,680	317,680	46,000	46,000
Preferred stock, issued							0	0	16,450	16,450
Preferred stock, outstanding							0	0	16,450	16,450

[1] At December 31, 2012 and 2011, includes $0 and $30 of cash, $0 and $7 of other short-term investments, $50 and $50 of commercial mortgage loans, $0 and $223 of home equity loans, $0 and $259 of automobile loans, ($5) and ($10) of ALLL, $3 and $4 of other assets, $0 and $4 of other liabilities, $0 and $191 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 10.