Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	$ 78		$ 97
60-89 days past due and still accruing	40		30
90 days or more past due and still accruing	7		16
Total loans past due and still accruing	125		143
Nonaccrual loans	326		350
Current loans	47,431	[1]	44,977	[1]
Total loans	47,882		45,470
Carrying amount PCI loans	3		5
Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	61		72
60-89 days past due and still accruing	36		24
90 days or more past due and still accruing	6		11
Total loans past due and still accruing	103		107
Nonaccrual loans	247		262
Current loans	43,496	[1]	41,167	[1]
Total loans	43,846		41,536
Business loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	12		36
60-89 days past due and still accruing	26		17
90 days or more past due and still accruing	0		4
Total loans past due and still accruing	38		57
Nonaccrual loans	72		81
Current loans	30,876	[1]	28,677	[1]
Total loans	30,986		28,815
Business loans | Real estate construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	25		0
60-89 days past due and still accruing	0		0
90 days or more past due and still accruing	0		0
Total loans past due and still accruing	25		0
Nonaccrual loans	19		21
Current loans	1,895	[1]	1,741	[1]
Total loans	1,939		1,762
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 loans past due and still accruing	0	[2]	0	[2]
Nonaccrual loans	18	[2]	20	[2]
Current loans	1,583	[1],[2]	1,427	[1],[2]
Total loans	1,601	[2]	1,447	[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	25	[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 loans past due and still accruing	25	[3]	0	[3]
Nonaccrual loans	1	[3]	1	[3]
Current loans	312	[1],[3]	314	[1],[3]
Total loans	338	[3]	315	[3]
Business loans | Commercial mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	24		36
60-89 days past due and still accruing	10		7
90 days or more past due and still accruing	5		4
Total loans past due and still accruing	39		47
Nonaccrual loans	156		156
Current loans	8,552	[1]	8,584	[1]
Total loans	8,747		8,787
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	5	[2]	9	[2]
60-89 days past due and still accruing	2	[2]	1	[2]
90 days or more past due and still accruing	0	[2]	0	[2]
Total loans past due and still accruing	7	[2]	10	[2]
Nonaccrual loans	57	[2]	51	[2]
Current loans	1,712	[1],[2]	1,617	[1],[2]
Total loans	1,776	[2]	1,678	[2]
Business loans | Commercial mortgage | Other business lines
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	19	[3]	27	[3]
60-89 days past due and still accruing	8	[3]	6	[3]
90 days or more past due and still accruing	5	[3]	4	[3]
Total loans past due and still accruing	32	[3]	37	[3]
Nonaccrual loans	99	[3]	105	[3]
Current loans	6,840	[1],[3]	6,967	[1],[3]
Total loans	6,971	[3]	7,109	[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 loans past due and still accruing	0		0
Nonaccrual loans	0		0
Current loans	822	[1]	845	[1]
Total loans	822		845
Business loans | International
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	1		3
Total loans past due and still accruing	1		3
Nonaccrual loans	0		4
Current loans	1,351	[1]	1,320	[1]
Total loans	1,352		1,327
Retail loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	17		25
60-89 days past due and still accruing	4		6
90 days or more past due and still accruing	1		5
Total loans past due and still accruing	22		36
Nonaccrual loans	79		88
Current loans	3,935	[1]	3,810	[1]
Total loans	4,036		3,934
Retail loans | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	9		15
60-89 days past due and still accruing	2		3
90 days or more past due and still accruing	0		0
Total loans past due and still accruing	11		18
Nonaccrual loans	45		53
Current loans	1,719	[1]	1,626	[1]
Total loans	1,775		1,697
Retail loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	8		10
60-89 days past due and still accruing	2		3
90 days or more past due and still accruing	1		5
Total loans past due and still accruing	11		18
Nonaccrual loans	34		35
Current loans	2,216	[1]	2,184	[1]
Total loans	2,261		2,237
Retail loans | Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	7		6
60-89 days past due and still accruing	2		2
90 days or more past due and still accruing	1		0
Total loans past due and still accruing	10		8
Nonaccrual loans	32		33
Current loans	1,532	[1]	1,476	[1]
Total loans	1,574		1,517
Retail loans | Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 days past due and still accruing	1		4
60-89 days past due and still accruing	0		1
90 days or more past due and still accruing	0		5
Total loans past due and still accruing	1		10
Nonaccrual loans	2		2
Current loans	684	[1]	708	[1]
Total loans	$ 687		$ 720

[1] Included purchased credit-impaired (PCI) loans with a total carrying value of $3 million at June 30, 2014 and $5 million at December 31, 2013.

[2] Primarily loans to real estate developers.

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