Loans and Allowance for Credit Losses, by Credit Impairment Methodology (Details) (USD $) In Millions	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated	$ 14,435		$ 16,963
Allowance for Credit Losses, Individually evaluated	6,554		6,202
Allowance for Credit Losses, Purchased Credit-Impaired	273		298
Total allowance for credit losses	21,262	22,383	23,463	25,085	25,656	25,031
Financing Receivable, Collectively evaluated	687,383		690,099
Financing Receivable, Individually evaluated	25,845		25,738
Purchased Credit Impaired Loans	38,693		41,430
Loans	751,921		757,267
Total Commercial [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated	4,799		5,424
Allowance for Credit Losses, Individually evaluated	2,399		2,479
Allowance for Credit Losses, Purchased Credit-Impaired	215		266
Total allowance for credit losses	7,413	7,973	8,169	8,559	8,833	8,141
Financing Receivable, Collectively evaluated	313,514		302,392
Financing Receivable, Individually evaluated	10,159		11,731
Purchased Credit Impaired Loans	7,016		7,935
Loans	330,689		322,058
Total Consumer [Member]
Loans and Allowance for Credit Losses, by Credit Impairment Method [Abstract]
Allowance for Credit Losses, Collectively evaluated	9,636		11,539
Allowance for Credit Losses, Individually evaluated	4,155		3,723
Allowance for Credit Losses, Purchased Credit-Impaired	58		32
Total allowance for credit losses	13,849	14,410	15,294	16,526	16,823	16,890
Financing Receivable, Collectively evaluated	373,869		387,707
Financing Receivable, Individually evaluated	15,686		14,007
Purchased Credit Impaired Loans	31,677		33,495
Loans	$ 421,232		$ 435,209