Business Segment Information (Business Segment Financial Results) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net interest income (expense) (FTE)									$ 1,675		$ 1,731		$ 1,657
Provision for credit losses									46		79		144
Noninterest income									826		818		792
Noninterest expenses	473	417	416	416	427	449	433	448	1,722		1,757		1,771
Provision (benefit) for income taxes (FTE)									192		192		141
Net income (loss)	117	147	143	134	130	117	144	130	541		521		393
Net credit-related charge-offs									73		170		328
Assets, average									63,936		62,572		56,917
Loans, average									44,412		43,306		40,075
Deposits, average									51,711		49,533		43,762
Return on average assets									0.85%	[1]	0.83%	[1]	0.69%	[1]
Efficiency ratio									68.83%	[2]	69.24%	[2]	72.73%	[2]
Business Bank
Net interest income (expense) (FTE)									1,503		1,517		1,390
Provision for credit losses									54		34		29
Noninterest income									326		319		306
Noninterest expenses									643		602		650
Provision (benefit) for income taxes (FTE)									347		374		318
Net income (loss)									785		826		699
Net credit-related charge-offs									43		107		199
Assets, average									35,532		34,447		30,686
Loans, average									34,473		33,470		30,074
Deposits, average									26,169		24,837		21,394
Return on average assets									2.21%	[1]	2.40%	[1]	2.27%	[1]
Efficiency ratio									35.18%	[2]	32.79%	[2]	38.33%	[2]
Retail Bank
Net interest income (expense) (FTE)									610		647		621
Provision for credit losses									13		24		77
Noninterest income									175		173		169
Noninterest expenses									708		723		683
Provision (benefit) for income taxes (FTE)									22		23		12
Net income (loss)									42		50		18
Net credit-related charge-offs									22		40		89
Assets, average									5,974		6,008		5,815
Loans, average									5,289		5,308		5,292
Deposits, average									21,247		20,623		18,912
Return on average assets									0.19%	[1]	0.23%	[1]	0.09%	[1]
Efficiency ratio									89.95%	[2]	87.93%	[2]	85.57%	[2]
Wealth Management
Net interest income (expense) (FTE)									184		187		182
Provision for credit losses									(18)		19		40
Noninterest income									252		258		239
Noninterest expenses									319		320		315
Provision (benefit) for income taxes (FTE)									48		39		25
Net income (loss)									87		67		41
Net credit-related charge-offs									8		23		40
Assets, average									4,807		4,623		4,720
Loans, average									4,650		4,528		4,709
Deposits, average									3,775		3,680		3,096
Return on average assets									1.82%	[1]	1.45%	[1]	0.87%	[1]
Efficiency ratio									73.14%	[2]	74.21%	[2]	76.74%	[2]
Finance
Net interest income (expense) (FTE)									(653)		(658)		(572)
Provision for credit losses									0		0		0
Noninterest income									61		60		74
Noninterest expenses									10		12		11
Provision (benefit) for income taxes (FTE)									(226)		(228)		(193)
Net income (loss)									(376)		(382)		(316)
Net credit-related charge-offs									0		0		0
Assets, average									11,422		11,881		10,252
Loans, average									0		0		0
Deposits, average									312		206		231
Other
Net interest income (expense) (FTE)									31		38		36
Provision for credit losses									(3)		2		(2)
Noninterest income									12		8		4
Noninterest expenses									42		100		112
Provision (benefit) for income taxes (FTE)									1		(16)		(21)
Net income (loss)									3		(40)		(49)
Net credit-related charge-offs									0		0		0
Assets, average									6,201		5,613		5,444
Loans, average									0		0		0
Deposits, average									$ 208		$ 187		$ 129

[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.