Loans and Allowance for Credit Losses, Allowance for Credit Losses by Category (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 22,383	$ 25,656	$ 23,463	$ 25,031
Provision for credit losses	1,838	3,989	4,048	9,319
Adjustment for passage of time on certain impaired loans (1)	(79)	(62)	(162)	(136)
Loan charge-offs	(3,514)	(5,106)	(7,341)	(10,979)
Loan recoveries	676	617	1,293	1,160
Net loan charge-offs	(2,838)	(4,489)	(6,048)	(9,819)
Allowances related to business combinations/other	(42)	(9)	(39)	690
Allowance for credit losses, ending balance	21,262	25,085	21,262	25,085
Total Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	7,973	8,833	8,169	8,141
Provision for credit losses	(27)	1,117	445	3,221
Adjustment for passage of time on certain impaired loans (1)	(39)	(35)	(84)	(76)
Loan charge-offs	(713)	(1,546)	(1,531)	(3,080)
Loan recoveries	211	190	406	344
Net loan charge-offs	(502)	(1,356)	(1,125)	(2,736)
Allowances related to business combinations/other	8	0	8	9
Allowance for credit losses, ending balance	7,413	8,559	7,413	8,559
Total Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	14,410	16,823	15,294	16,890
Provision for credit losses	1,865	2,872	3,603	6,098
Adjustment for passage of time on certain impaired loans (1)	(40)	(27)	(78)	(60)
Loan charge-offs	(2,801)	(3,560)	(5,810)	(7,899)
Loan recoveries	465	427	887	816
Net loan charge-offs	(2,336)	(3,133)	(4,923)	(7,083)
Allowances related to business combinations/other	(50)	(9)	(47)	681
Allowance for credit losses, ending balance	$ 13,849	$ 16,526	$ 13,849	$ 16,526