Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	$ 59		$ 62
Recorded investment in impaired loans with related allowance	201		212
Recorded investment total impaired loans	260		274
Unpaid principal balance	373		415
Related allowance for loan losses	39		57
Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	14		11
Recorded investment in impaired loans with related allowance	201		212
Recorded investment total impaired loans	215		223
Unpaid principal balance	318		344
Related allowance for loan losses	39		57
Business loans | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	3		10
Recorded investment in impaired loans with related allowance	58		64
Recorded investment total impaired loans	61		74
Unpaid principal balance	92		121
Related allowance for loan losses	11		26
Business loans | Real estate construction
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0		0
Recorded investment in impaired loans with related allowance	18		21
Recorded investment total impaired loans	18		21
Unpaid principal balance	22		25
Related allowance for loan losses	2		3
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0	[1]	0	[1]
Recorded investment in impaired loans with related allowance	18	[1]	20	[1]
Recorded investment total impaired loans	18	[1]	20	[1]
Unpaid principal balance	21	[1]	24	[1]
Related allowance for loan losses	2	[1]	3	[1]
Business loans | Real estate construction | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	0	[2]	0	[2]
Recorded investment in impaired loans with related allowance	0	[2]	1	[2]
Recorded investment total impaired loans	0	[2]	1	[2]
Unpaid principal balance	1	[2]	1	[2]
Related allowance for loan losses	0	[2]	0	[2]
Business loans | Commercial mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	9		1
Recorded investment in impaired loans with related allowance	125		123
Recorded investment total impaired loans	134		124
Unpaid principal balance	202		194
Related allowance for loan losses	26		27
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	7	[1]	0	[1]
Recorded investment in impaired loans with related allowance	55	[1]	60	[1]
Recorded investment total impaired loans	62	[1]	60	[1]
Unpaid principal balance	106	[1]	104	[1]
Related allowance for loan losses	12	[1]	12	[1]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	2	[2]	1	[2]
Recorded investment in impaired loans with related allowance	70	[2]	63	[2]
Recorded investment total impaired loans	72	[2]	64	[2]
Unpaid principal balance	96	[2]	90	[2]
Related allowance for loan losses	14	[2]	15	[2]
Business loans | International
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	2		0
Recorded investment in impaired loans with related allowance	0		4
Recorded investment total impaired loans	2		4
Unpaid principal balance	2		4
Related allowance for loan losses	0		1
Retail loans
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	45	[3]	51	[3]
Recorded investment in impaired loans with related allowance	0	[3]	0	[3]
Recorded investment total impaired loans	45	[3]	51	[3]
Unpaid principal balance	55	[3]	71	[3]
Related allowance for loan losses	0	[3]	0	[3]
Retail loans | Residential mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	30		35
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	30		35
Unpaid principal balance	35		42
Related allowance for loan losses	0		0
Retail loans | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	15		16
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	15		16
Unpaid principal balance	20		29
Related allowance for loan losses	0		0
Retail loans | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	10		12
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	10		12
Unpaid principal balance	15		17
Related allowance for loan losses	0		0
Retail loans | Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Recorded investment in impaired loans with no related allowance	5		4
Recorded investment in impaired loans with related allowance	0		0
Recorded investment total impaired loans	5		4
Unpaid principal balance	5		12
Related allowance for loan losses	$ 0		$ 0

[1] Primarily loans to real estate developers.

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

[3] Individually evaluated retail loans had no related allowance for loan losses, primarily due to policy changes which resulted in direct write-downs of restructured retail loans.