Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters of Credit (Rollforward of Allowance For Loan and Lease Losses and Associated Loan Data) (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance				$ 3,609,000,000	[1]	$ 4,036,000,000
Charge-offs				(786,000,000)		(1,265,000,000)
Recoveries				373,000,000		377,000,000
Net charge-offs				(413,000,000)		(888,000,000)
Provision For Credit Losses	55,000,000		137,000,000	221,000,000		530,000,000
Net change in allowance for unfunded loan commitments and letters of credit				(9,000,000)		15,000,000
Other				(2,000,000)		(2,000,000)
Ending Balance	3,406,000,000	[1]	3,691,000,000	3,406,000,000	[1]	3,691,000,000
TDRs individually evaluated for impairment - associated allowance	408,000,000		510,000,000	408,000,000		510,000,000	470,000,000
Other loans individually evaluated for impairment - associated allowance	98,000,000		176,000,000	98,000,000		176,000,000
Loans collectively evaluated for impairment - associated allowance	2,009,000,000		1,944,000,000	2,009,000,000		1,944,000,000
Purchased impaired loans - associated allowance	891,000,000		1,061,000,000	891,000,000		1,061,000,000
TDRs individually evaluated for impairment	2,615,000,000		2,802,000,000	2,615,000,000		2,802,000,000
Other loans individually evaluated for impairment	402,000,000		786,000,000	402,000,000		786,000,000
Loans collectively evaluated for impairment	191,671,000,000		181,761,000,000	191,671,000,000		181,761,000,000
Fair value option loans	1,017,000,000		1,109,000,000	1,017,000,000		1,109,000,000
Purchased impaired loans	5,167,000,000		6,398,000,000	5,167,000,000		6,398,000,000	6,106,000,000
Total loans	200,872,000,000	[1],[2]	192,856,000,000	200,872,000,000	[1],[2]	192,856,000,000	195,613,000,000	[1],[2]
Portfolio segment ALLL as a percentage of total ALLL	100.00%		100.00%	100.00%		100.00%
Ratio of the allowance for loan and lease losses to total loans	1.70%		1.91%	1.70%		1.91%
Impact of alignment with interagency guidance - Additional chargeoffs taken						134,000,000
Evaluated for impairment based upon collateral values
Financing Receivable Allowance For Credit Losses [Line Items]
Loans collectively evaluated for impairment	221,000,000		274,000,000	221,000,000		274,000,000
Total commercial lending [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance				1,547,000,000		1,774,000,000
Charge-offs				(286,000,000)		(493,000,000)
Recoveries				230,000,000		266,000,000
Net charge-offs				(56,000,000)		(227,000,000)
Provision For Credit Losses				89,000,000		53,000,000
Net change in allowance for unfunded loan commitments and letters of credit				(9,000,000)		(4,000,000)
Other				(2,000,000)		(2,000,000)
Ending Balance	1,569,000,000		1,594,000,000	1,569,000,000		1,594,000,000
TDRs individually evaluated for impairment - associated allowance	26,000,000		31,000,000	26,000,000		31,000,000
Other loans individually evaluated for impairment - associated allowance	98,000,000		176,000,000	98,000,000		176,000,000
Loans collectively evaluated for impairment - associated allowance	1,349,000,000		1,233,000,000	1,349,000,000		1,233,000,000
Purchased impaired loans - associated allowance	96,000,000		154,000,000	96,000,000		154,000,000
TDRs individually evaluated for impairment	551,000,000		581,000,000	551,000,000		581,000,000
Other loans individually evaluated for impairment	402,000,000		786,000,000	402,000,000		786,000,000
Loans collectively evaluated for impairment	122,705,000,000		112,286,000,000	122,705,000,000		112,286,000,000
Purchased impaired loans	405,000,000		782,000,000	405,000,000		782,000,000
Total loans	124,063,000,000		114,435,000,000	124,063,000,000		114,435,000,000	117,145,000,000
Portfolio segment ALLL as a percentage of total ALLL	46.00%		43.00%	46.00%		43.00%
Ratio of the allowance for loan and lease losses to total loans	1.26%		1.39%	1.26%		1.39%
Total consumer lending [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance				2,062,000,000		2,262,000,000
Charge-offs				(500,000,000)		(772,000,000)
Recoveries				143,000,000		111,000,000
Net charge-offs				(357,000,000)		(661,000,000)
Provision For Credit Losses				132,000,000		477,000,000
Net change in allowance for unfunded loan commitments and letters of credit						19,000,000
Ending Balance	1,837,000,000		2,097,000,000	1,837,000,000		2,097,000,000
TDRs individually evaluated for impairment - associated allowance	382,000,000		479,000,000	382,000,000		479,000,000
Loans collectively evaluated for impairment - associated allowance	660,000,000		711,000,000	660,000,000		711,000,000
Purchased impaired loans - associated allowance	795,000,000		907,000,000	795,000,000		907,000,000
TDRs individually evaluated for impairment	2,064,000,000		2,221,000,000	2,064,000,000		2,221,000,000
Loans collectively evaluated for impairment	68,966,000,000		69,475,000,000	68,966,000,000		69,475,000,000
Fair value option loans	1,017,000,000		1,109,000,000	1,017,000,000		1,109,000,000
Purchased impaired loans	4,762,000,000		5,616,000,000	4,762,000,000		5,616,000,000
Total loans	$ 76,809,000,000		$ 78,421,000,000	$ 76,809,000,000		$ 78,421,000,000	$ 78,468,000,000
Portfolio segment ALLL as a percentage of total ALLL	54.00%		57.00%	54.00%		57.00%
Ratio of the allowance for loan and lease losses to total loans	2.39%		2.67%	2.39%		2.67%

[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).

[2] Amounts represent items for which we have elected the fair value option.