Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	$ 97		$ 114
60-89 days past due and still accruing	30		44
90 days or more past due and still accruing	16		23
Total past due loans and still accruing	143		181
Nonaccrual loans	350		519
Current loans	44,977	[1]	45,357	[1]
Total loans	45,470		46,057
Carrying amount PCI loans	5		36
Real estate construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,762		1,240
Real estate construction | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,447	[2]	1,049	[2]
Real estate construction | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	315	[3]	191	[3]
Commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	8,787		9,472
Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,678	[2]	1,873	[2]
Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	7,109	[3]	7,599	[3]
Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	72		74
60-89 days past due and still accruing	24		32
90 days or more past due and still accruing	11		16
Total past due loans and still accruing	107		122
Nonaccrual loans	262		414
Current loans	41,167	[1]	41,841	[1]
Total loans	41,536		42,377
Business loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	36		23
60-89 days past due and still accruing	17		19
90 days or more past due and still accruing	4		5
Total past due loans and still accruing	57		47
Nonaccrual loans	81		103
Current loans	28,677	[1]	29,363	[1]
Total loans	28,815		29,513
Business loans | Real estate construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0		0
60-89 days past due and still accruing	0		0
90 days or more past due and still accruing	0		0
Total past due loans and still accruing	0		0
Nonaccrual loans	21		33
Current loans	1,741	[1]	1,207	[1]
Total loans	1,762		1,240
Business loans | Real estate construction | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0	[2]	0	[2]
60-89 days past due and still accruing	0	[2]	0	[2]
90 days or more past due and still accruing	0	[2]	0	[2]
Total past due loans and still accruing	0	[2]	0	[2]
Nonaccrual loans	20	[2]	30	[2]
Current loans	1,427	[1],[2]	1,019	[1],[2]
Total loans	1,447	[2]	1,049	[2]
Business loans | Real estate construction | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0	[3]	0	[3]
60-89 days past due and still accruing	0	[3]	0	[3]
90 days or more past due and still accruing	0	[3]	0	[3]
Total past due loans and still accruing	0	[3]	0	[3]
Nonaccrual loans	1	[3]	3	[3]
Current loans	314	[1],[3]	188	[1],[3]
Total loans	315	[3]	191	[3]
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	36		47
60-89 days past due and still accruing	7		13
90 days or more past due and still accruing	4		8
Total past due loans and still accruing	47		68
Nonaccrual loans	156		275
Current loans	8,584	[1]	9,129	[1]
Total loans	8,787		9,472
Business loans | Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	9	[2]	20	[2]
60-89 days past due and still accruing	1	[2]	4	[2]
90 days or more past due and still accruing	0	[2]	0	[2]
Total past due loans and still accruing	10	[2]	24	[2]
Nonaccrual loans	51	[2]	94	[2]
Current loans	1,617	[1],[2]	1,755	[1],[2]
Total loans	1,678	[2]	1,873	[2]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	27	[3]	27	[3]
60-89 days past due and still accruing	6	[3]	9	[3]
90 days or more past due and still accruing	4	[3]	8	[3]
Total past due loans and still accruing	37	[3]	44	[3]
Nonaccrual loans	105	[3]	181	[3]
Current loans	6,967	[1],[3]	7,374	[1],[3]
Total loans	7,109	[3]	7,599	[3]
Business loans | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0		0
60-89 days past due and still accruing	0		0
90 days or more past due and still accruing	0		0
Total past due loans and still accruing	0		0
Nonaccrual loans	0		3
Current loans	845	[1]	856	[1]
Total loans	845		859
Business loans | International
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	0		4
60-89 days past due and still accruing	0		0
90 days or more past due and still accruing	3		3
Total past due loans and still accruing	3		7
Nonaccrual loans	4		0
Current loans	1,320	[1]	1,286	[1]
Total loans	1,327		1,293
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	25		40
60-89 days past due and still accruing	6		12
90 days or more past due and still accruing	5		7
Total past due loans and still accruing	36		59
Nonaccrual loans	88		105
Current loans	3,810	[1]	3,516	[1]
Total loans	3,934		3,680
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	15		27
60-89 days past due and still accruing	3		6
90 days or more past due and still accruing	0		2
Total past due loans and still accruing	18		35
Nonaccrual loans	53		70
Current loans	1,626	[1]	1,422	[1]
Total loans	1,697		1,527
Retail loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	10		13
60-89 days past due and still accruing	3		6
90 days or more past due and still accruing	5		5
Total past due loans and still accruing	18		24
Nonaccrual loans	35		35
Current loans	2,184	[1]	2,094	[1]
Total loans	2,237		2,153
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	6		9
60-89 days past due and still accruing	2		3
90 days or more past due and still accruing	0		0
Total past due loans and still accruing	8		12
Nonaccrual loans	33		31
Current loans	1,476	[1]	1,494	[1]
Total loans	1,517		1,537
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	4		4
60-89 days past due and still accruing	1		3
90 days or more past due and still accruing	5		5
Total past due loans and still accruing	10		12
Nonaccrual loans	2		4
Current loans	708	[1]	600	[1]
Total loans	$ 720		$ 616

[1] Included purchased credit-impaired (PCI) loans with a total carrying value of $5 million and $36 million at December 31, 2013 and 2012, respectively.

[2] Primarily loans to real estate developers.

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