Asset Quality (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2012 Loan	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
Asset Quality (Textual) [Abstract]
Percentage of carrying amount of our commercial nonperforming loans outstanding	58.00%
Percentage of nonperforming loans outstanding face value	68.00%
Percentage of loans held for sale and other nonperforming assets	63.00%
Number of largest nonperforming loans	20
Aggregate carrying amount of largest nonperforming loans	$ 215,000,000
Percentage of total loans on nonperforming status	32.00%
Total loans on nonperforming status from continuing operations	284,000,000
Percentage of total loans on nonperforming status prior year	32.00%
Net reduction to interest income	6,000,000	31,000,000
Interest income recognized on outstanding balances	1,000,000	1,000,000
Total Restructured loans	293,000,000	242,000,000	276,000,000
Addition in restructured loans	56,000,000
Restructured loans partially in payments and charge-offs	39,000,000
Trial period HAMP loans included in TDR amounts	3,000,000
Total current loan	47,971,000,000	47,041,000,000
Additional funds to borrowers related to lending related commitments	24,000,000	44,000,000	25,000,000
Percent of total current loan	97.00%
Total Past Due Loan	1,255,000,000	1,511,000,000
Percent of total past due loans	3.00%
Minimum outstanding impaired commercial loans	2,500,000
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
ALLL	944,000,000	1,372,000,000	1,004,000,000
ALLL percentage	1.92%	2.83%
ALLL of non performing loans percentage	141.74%	155.03%
Foreign currency translation adjustment	(1,000,000)	1,000,000
Increase (decrease) in allowance for loan losses		(428,000,000)
Percentage decrease in allowance for loan losses		31.00%
Individually Evaluated for Impairment Allowance	38,000,000	39,000,000
Collectively Evaluated for Impairment, Outstanding	48,867,000,000	48,059,000,000
Individually Evaluated for Impairment corresponding allowance	359,000,000	493,000,000
Collectively evaluated for current corresponding allowance	906,000,000
Loans carried at fair value	2,800,000,000
Increase (decrease) in liability for credit losses on lending-related commitments		(24,000,000)
Liability for credit losses on lending-related commitments	$ 45,000,000	$ 69,000,000	$ 45,000,000	$ 73,000,000
Percentage of total allowance for credit losses	2.01%	2.97%