Credit Quality and Allowance for Credit Losses (Aging Analysis of Loans) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010		Jun. 30, 2010
30-59 days past due, still accruing	$ 289		$ 198
60-89 days past due, still accruing	54		83
90 days or more past due, still accruing	64		62
Total past due loans, still accruing	407		343
Nonaccrual loans	941		1,080
Current loans	37,845		38,813
Total loans	39,193		40,236		40,602
Business Loans [Member]
30-59 days past due, still accruing	258		150
60-89 days past due, still accruing	44		54
90 days or more past due, still accruing	38		41
Total past due loans, still accruing	340		245
Nonaccrual loans	868		1,007
Current loans	34,262		35,054
Total loans	35,470		36,306
Business Loans [Member] | Commercial Loans [Member]
30-59 days past due, still accruing	131		84
60-89 days past due, still accruing	20		28
90 days or more past due, still accruing	11		3
Total past due loans, still accruing	162		115
Nonaccrual loans	261		252
Current loans	21,629		21,778
Total loans	22,052		22,145
Business Loans [Member] | Real Estate Construction [Member]
30-59 days past due, still accruing	25		29
60-89 days past due, still accruing	1
90 days or more past due, still accruing	2		22
Total past due loans, still accruing	28		51
Nonaccrual loans	139		263
Current loans	1,561		1,939
Total loans	1,728		2,253
Business Loans [Member] | Real Estate Construction [Member] | Commercial Real Estate Business Line [Member]
30-59 days past due, still accruing	15	[1]	27	[1]
60-89 days past due, still accruing	1	[1]
90 days or more past due, still accruing	2	[1]	17	[1]
Total past due loans, still accruing	18	[1]	44	[1]
Nonaccrual loans	137	[1]	259	[1]
Current loans	1,188	[1]	1,523	[1]
Total loans	1,343	[1]	1,826	[1]
Business Loans [Member] | Real Estate Construction [Member] | Other Business Lines [Member]
30-59 days past due, still accruing	10	[2]	2	[2]
90 days or more past due, still accruing			5	[2]
Total past due loans, still accruing	10	[2]	7	[2]
Nonaccrual loans	2	[2]	4	[2]
Current loans	373	[2]	416	[2]
Total loans	385	[2]	427	[2]
Business Loans [Member] | Commercial Mortgage [Member]
30-59 days past due, still accruing	102		36
60-89 days past due, still accruing	23		26
90 days or more past due, still accruing	25		16
Total past due loans, still accruing	150		78
Nonaccrual loans	455		483
Current loans	8,974		9,206
Total loans	9,579		9,767
Business Loans [Member] | Commercial Mortgage [Member] | Commercial Real Estate Business Line [Member]
30-59 days past due, still accruing	31	[1]	8	[1]
60-89 days past due, still accruing	13	[1]	1	[1]
90 days or more past due, still accruing	7	[1]
Total past due loans, still accruing	51	[1]	9	[1]
Nonaccrual loans	186	[1]	181	[1]
Current loans	1,693	[1]	1,747	[1]
Total loans	1,930	[1]	1,937	[1]
Business Loans [Member] | Commercial Mortgage [Member] | Other Business Lines [Member]
30-59 days past due, still accruing	71	[2]	28	[2]
60-89 days past due, still accruing	10	[2]	25	[2]
90 days or more past due, still accruing	18	[2]	16	[2]
Total past due loans, still accruing	99	[2]	69	[2]
Nonaccrual loans	269	[2]	302	[2]
Current loans	7,281	[2]	7,459	[2]
Total loans	7,649	[2]	7,830	[2]
Business Loans [Member] | Lease Financing Loan [Member]
Nonaccrual loans	6		7
Current loans	943		1,002
Total loans	949		1,009
Business Loans [Member] | International Loan [Member]
30-59 days past due, still accruing			1
Total past due loans, still accruing			1
Nonaccrual loans	7		2
Current loans	1,155		1,129
Total loans	1,162		1,132
Retail Loans [Member]
30-59 days past due, still accruing	31		48
60-89 days past due, still accruing	10		29
90 days or more past due, still accruing	26		21
Total past due loans, still accruing	67		98
Nonaccrual loans	73		73
Current loans	3,583		3,759
Total loans	3,723		3,930
Retail Loans [Member] | Residential Mortgage Loan [Member]
30-59 days past due, still accruing	16		33
60-89 days past due, still accruing	4		23
90 days or more past due, still accruing	15		7
Total past due loans, still accruing	35		63
Nonaccrual loans	60		55
Current loans	1,396		1,501
Total loans	1,491		1,619
Retail Loans [Member] | Consumer Loans [Member]
30-59 days past due, still accruing	15		15
60-89 days past due, still accruing	6		6
90 days or more past due, still accruing	11		14
Total past due loans, still accruing	32		35
Nonaccrual loans	13		18
Current loans	2,187		2,258
Total loans	2,232		2,311
Retail Loans [Member] | Consumer Loans [Member] | Home Equity [Member]
30-59 days past due, still accruing	10		11
60-89 days past due, still accruing	5		4
90 days or more past due, still accruing	6		10
Total past due loans, still accruing	21		25
Nonaccrual loans	4		5
Current loans	1,597		1,674
Total loans	1,622		1,704
Retail Loans [Member] | Consumer Loans [Member] | Other Consumer [Member]
30-59 days past due, still accruing	5		4
60-89 days past due, still accruing	1		2
90 days or more past due, still accruing	5		4
Total past due loans, still accruing	11		10
Nonaccrual loans	9		13
Current loans	590		584
Total loans	$ 610		$ 607

[1] Primarily loans to real estate investors and developers.

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