Credit Quality And Allowance For Credit Losses Credit Quality And Allowance For Credit Losses (Troubled Debt Restructuring Subsequent Default) (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
Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	$ 48		$ 73		$ 48		$ 73
Subsequent Default During Period	0		15		2		35
Interest Rate Reductions
Financing Receivable, Modifications [Line Items]
Balance	5		2		5		2
Subsequent Default During Period	0		0		0		0
AB Note Restructures
Financing Receivable, Modifications [Line Items]
Balance			38				38
Subsequent Default During Period	0		0		0		0
Business loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	41		61		41		61
Subsequent Default During Period	0		15		2		35
Business loans | Commercial | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	12		14		12		14
Subsequent Default During Period	0		11		2		12
Business loans | Real estate construction | Commercial Real Estate business line | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	0	[1]	1	[1]	0	[1]	1	[1]
Subsequent Default During Period	0	[1]	0	[1]	0	[1]	0	[1]
Business loans | Commercial mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	28		46		28		46
Subsequent Default During Period	0		4		0		23
Business loans | Commercial mortgage | Commercial Real Estate business line | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	17	[1]	27	[1]	17	[1]	27	[1]
Subsequent Default During Period	0	[1]	0	[1]	0	[1]	16	[1]
Business loans | Commercial mortgage | Other business lines | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	11	[2]	19	[2]	11	[2]	19	[2]
Subsequent Default During Period	0	[2]	4	[2]	0	[2]	7	[2]
Business loans | International | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	1		0		1		0
Subsequent Default During Period	0		0		0		0
Retail loans | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	7		12		7		12
Subsequent Default During Period	0		0		0		0
Retail loans | Residential mortgage | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	2	[3]	5	[3]	2	[3]	5	[3]
Subsequent Default During Period	0		0		0		0
Retail loans | Consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	5		7		5		7
Subsequent Default During Period	0		0		0		0
Retail loans | Consumer | Home equity | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	4	[3]	5	[3]	4	[3]	5	[3]
Subsequent Default During Period	0		0		0		0
Retail loans | Consumer | Other consumer | Principal Deferrals
Financing Receivable, Modifications [Line Items]
Balance	1	[3]	2	[3]	1	[3]	2	[3]
Subsequent Default During Period	$ 0		$ 0		$ 0		$ 0

[1] Primarily loans to real estate developers.

[2] Primarily loans secured by owner-occupied real estate.

[3] Includes bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt.