Asset Quality (Details 10) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Dec. 31, 2010
Financing Receivable Individually Evaluated For Impairment Specifically Allocated Allowance and Zero Specific Allocation [Line Items]
Financing receivable individually evaluated for impairment specifically allocated allowance	$ 488,000,000		$ 488,000,000		$ 488,000,000
Financing Receivable, Impaired [Line Items]
Unpaid impaired financing receivable principal balance	706,000,000		706,000,000		706,000,000
Allowance allocated under impaired loans	81,000,000		81,000,000		81,000,000
Impaired financing receivable related allowance	127,000,000		127,000,000		127,000,000
Asset Quality (Textuals) [Abstract]
Maximum level for the impaired loan's outstanding balance leading to a further analysis to determine the probable loss content and assign a specific allowance to the loan			2,500,000
Allowance for loan losses	1,230,000,000	2,219,000,000	1,230,000,000	2,219,000,000	1,230,000,000	1,604,000,000
Percentage of allowance for loan losses	2.57%	4.16%	2.57%	4.16%	2.57%	3.20%
Percentage of allowance for loan losses of nonperforming loans	146.08%	130.30%	146.08%	130.30%	146.08%
Percent of total current loan			97.00%
Percent of total past due loans	3.00%		3.00%		3.00%
Number of days to designate commercial loans will be charged off in full or charged down to the fair value of the underlying collateral payment due period			180 days
Number of days to designate the charge-off policy for most consumer loans taking effect, payment due period			120 days
Number of days to designate home equity and residential mortgage loans to get charged down to the fair value of the underlying collateral payment due period			180 days
Total current loan	46,415,000,000		46,415,000,000		46,415,000,000
Total Past Due Loan	1,425,000,000		1,425,000,000		1,425,000,000
Impaired loans	706,000,000	1,435,000,000	706,000,000	1,435,000,000	706,000,000	881,000,000
Average balance of Impaired loans	718,000,000	1,600,000,000
Total Restructured loans	252,000,000		252,000,000		252,000,000	297,000,000
Impaired loans with a specifically allocated allowance	488,000,000	1,099,000,000	488,000,000	1,099,000,000	488,000,000	621,000,000
Specifically allocated allowance for impaired loans	46,000,000	157,000,000	46,000,000	157,000,000	46,000,000	58,000,000
Addition in restructured loans			87,000,000
Decrease in restructured loans			132,000,000
Threshold of impaired loans	2,500,000		2,500,000		2,500,000
Financing receivable evaluated for impairment	218,000,000		218,000,000		218,000,000
Corresponding allowance for Impairment	46,000,000		46,000,000		46,000,000
Collectively Evaluated for Impairment	47,352,000,000		47,352,000,000		47,352,000,000
Collectively evaluated for current corresponding allowance	1,200,000,000		1,200,000,000		1,200,000,000
Increase (decrease) in allowance for loan losses					989,000,000
Percentage decrease in allowance for loan losses			45.00%
Increase (decrease) in liability for credit losses on lending-related commitments			57,000,000	52,000,000
Percentage of total allowance for credit losses	2.69%	4.36%	2.69%	4.36%	2.69%
Percentage of carrying amount of our commercial nonperforming loans outstanding	57.00%		57.00%		57.00%
Percentage of nonperforming loans outstanding face value	64.00%		64.00%		64.00%
Percentage of loans held for sale and other nonperforming assets	60.00%		60.00%		60.00%
Number of largest nonperforming loans	20		20		20
Aggregate carrying amount of largest nonperforming loans	276,000,000		276,000,000		276,000,000
Percentage of total loans on nonperforming status	33.00%		33.00%		33.00%
Total loans on nonperforming status from continuing operations		441,000,000		441,000,000		306,000,000
Percentage of total loans on nonperforming status prior year		25.00%		25.00%		29.00%
Foreign currency translation adjustment	0	1,000,000	1,000,000	1,000,000
Additional Funds to Borrowers Related to Lending Related Commitments	0		0		0
Net reduction to interest income			5,000,000			22,000,000
Financing Receivable Individually Evaluated For Impairment Specifically Allocated Allowance [Member]
Financing Receivable Individually Evaluated For Impairment Specifically Allocated Allowance and Zero Specific Allocation [Line Items]
Financing receivable individually evaluated for impairment specifically allocated allowance	166,000,000		166,000,000		166,000,000
Financing Receivable Individually Evaluated for Impairment Zero Specific Allocation [Member]
Financing Receivable Individually Evaluated For Impairment Specifically Allocated Allowance and Zero Specific Allocation [Line Items]
Financing receivable individually evaluated for impairment specifically allocated allowance	322,000,000		322,000,000		322,000,000
Loans with an allowance recorded [Member] | Impaired Financing Receivable With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid impaired financing receivable principal balance	384,000,000		384,000,000		384,000,000
Impaired financing receivable related allowance	$ 127,000,000		$ 127,000,000		$ 127,000,000