Business Segment Information (Business Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Net interest income (expense) (FTE)			$ 828		$ 831
Provision for credit losses	11	13	20		29
Noninterest income	220	222	428		435
Noninterest expenses	404	416	810		832
Provision (benefit) for income taxes (FTE)			136		128
Net income (loss)	151	143	290		277
Net credit-related charge-offs (recoveries)			21		41
Assets, average			64,794		63,733
Loans, average			45,905		44,756
Deposits, average			53,079		51,095
Return on average assets			0.90%	[1]	0.87%	[1]
Efficiency ratio			64.55%	[2]	65.59%	[2]
Business Bank
Net interest income (expense) (FTE)			747		748
Provision for credit losses			48		31
Noninterest income			181		184
Noninterest expenses			289		293
Provision (benefit) for income taxes (FTE)			198		203
Net income (loss)			393		405
Net credit-related charge-offs (recoveries)			18		28
Assets, average			36,686		35,896
Loans, average			35,732		34,854
Deposits, average			27,204		25,752
Return on average assets			2.14%	[1]	2.26%	[1]
Efficiency ratio			31.18%	[2]	31.43%	[2]
Retail Bank
Net interest income (expense) (FTE)			295		309
Provision for credit losses			(2)		11
Noninterest income			82		86
Noninterest expenses			342		352
Provision (benefit) for income taxes (FTE)			13		11
Net income (loss)			24		21
Net credit-related charge-offs (recoveries)			7		11
Assets, average			6,051		5,967
Loans, average			5,384		5,274
Deposits, average			21,505		21,145
Return on average assets			0.22%	[1]	0.19%	[1]
Efficiency ratio			90.71%	[2]	88.66%	[2]
Wealth Management
Net interest income (expense) (FTE)			92		92
Provision for credit losses			(17)		(10)
Noninterest income			132		130
Noninterest expenses			157		157
Provision (benefit) for income taxes (FTE)			30		26
Net income (loss)			54		49
Net credit-related charge-offs (recoveries)			(4)		2
Assets, average			4,968		4,783
Loans, average			4,789		4,628
Deposits, average			3,822		3,691
Return on average assets			2.19%	[1]	2.06%	[1]
Efficiency ratio			70.47%	[2]	70.48%	[2]
Finance
Net interest income (expense) (FTE)			(318)		(333)
Provision for credit losses			0		0
Noninterest income			29		29
Noninterest expenses			5		5
Provision (benefit) for income taxes (FTE)			(111)		(112)
Net income (loss)			(183)		(197)
Net credit-related charge-offs (recoveries)			0		0
Assets, average			11,092		11,786
Loans, average			0		0
Deposits, average			305		303
Other
Net interest income (expense) (FTE)			12		15
Provision for credit losses			(9)		(3)
Noninterest income			4		6
Noninterest expenses			17		25
Provision (benefit) for income taxes (FTE)			6		0
Net income (loss)			2		(1)
Net credit-related charge-offs (recoveries)			0		0
Assets, average			5,997		5,301
Loans, average			0		0
Deposits, average			$ 243		$ 204

[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.