Business Segment Information (Business Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Net interest income (expense) (FTE)			$ 1,243		$ 1,244
Provision for credit losses	5	8	25		37
Noninterest income	215	228	643		663
Noninterest expenses	397	417	1,207		1,249
Provision (benefit) for income taxes (FTE)			210		197
Net income (loss)	154	147	444		424
Net credit-related charge-offs			24		60
Assets, average			65,336		63,707
Loans, average			46,327		44,533
Deposits, average			53,781		51,355
Return on average assets			0.91%	[1]	0.89%	[1]
Efficiency ratio			63.99%	[2]	65.45%	[2]
Business Bank
Net interest income (expense) (FTE)			1,124		1,115
Provision for credit losses			45		29
Noninterest income			275		287
Noninterest expenses			441		446
Provision (benefit) for income taxes (FTE)			311		312
Net income (loss)			602		615
Net credit-related charge-offs			16		37
Assets, average			37,094		35,694
Loans, average			36,124		34,626
Deposits, average			27,755		25,931
Return on average assets			2.17%	[1]	2.30%	[1]
Efficiency ratio			31.56%	[2]	31.78%	[2]
Retail Bank
Net interest income (expense) (FTE)			446		460
Provision for credit losses			(2)		21
Noninterest income			123		132
Noninterest expenses			524		530
Provision (benefit) for income taxes (FTE)			16		14
Net income (loss)			31		27
Net credit-related charge-offs			7		18
Assets, average			6,074		5,967
Loans, average			5,406		5,278
Deposits, average			21,600		21,183
Return on average assets			0.19%	[1]	0.17%	[1]
Efficiency ratio			91.81%	[2]	89.19%	[2]
Wealth Management
Net interest income (expense) (FTE)			139		138
Provision for credit losses			(11)		(8)
Noninterest income			195		191
Noninterest expenses			239		238
Provision (benefit) for income taxes (FTE)			38		35
Net income (loss)			68		64
Net credit-related charge-offs			1		5
Assets, average			4,981		4,785
Loans, average			4,797		4,629
Deposits, average			3,934		3,722
Return on average assets			1.81%	[1]	1.78%	[1]
Efficiency ratio			71.95%	[2]	72.64%	[2]
Finance
Net interest income (expense) (FTE)			(485)		(492)
Provision for credit losses			0		0
Noninterest income			44		47
Noninterest expenses			(24)		7
Provision (benefit) for income taxes (FTE)			(160)		(168)
Net income (loss)			(257)		(284)
Net credit-related charge-offs			0		0
Assets, average			11,070		11,553
Loans, average			0		0
Deposits, average			246		309
Other
Net interest income (expense) (FTE)			19		23
Provision for credit losses			(7)		(5)
Noninterest income			6		6
Noninterest expenses			27		28
Provision (benefit) for income taxes (FTE)			5		4
Net income (loss)			0		2
Net credit-related charge-offs			0		0
Assets, average			6,117		5,708
Loans, average			0		0
Deposits, average			$ 246		$ 210

[1] Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

[2] Noninterest expenses as a percentage of the sum of net interest income (FTE) and noninterest income excluding net securities gains.