Impaired Loans, Average Recorded Investment and Interest Income (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	$ 25,967	$ 20,736	$ 25,969	$ 19,303
Recognized interest income	233	191	464	350
Interest Income On Impaired Loans Abstract
Interest income, cash basis of accounting	47	54	85	101
Interest income, other	186	137	379	249
Interest income, Total	233	191	464	350
Commercial and Industrial Loans [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	2,860	3,346	3,016	3,455
Recognized interest income	21	20	45	49
Interest Income On Impaired Loans Abstract
Interest income, Total	21	20	45	49
Commercial Real Estate Mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	5,355	3,663	5,478	2,960
Recognized interest income	17	10	30	18
Interest Income On Impaired Loans Abstract
Interest income, Total	17	10	30	18
Commercial Real Estate Construction [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	2,426	3,002	2,560	2,891
Recognized interest income	11	8	25	12
Interest Income On Impaired Loans Abstract
Interest income, Total	11	8	25	12
Lease Financing [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	91	24	100	48
Recognized interest income	0	0	0	0
Interest Income On Impaired Loans Abstract
Interest income, Total	0	0	0	0
Foreign Loans [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	14	54	14	66
Recognized interest income	0	0	0	0
Interest Income On Impaired Loans Abstract
Interest income, Total	0	0	0	0
Total Commercial [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	10,746	10,089	11,168	9,420
Recognized interest income	49	38	100	79
Interest Income On Impaired Loans Abstract
Interest income, Total	49	38	100	79
Other revolving credit and installment [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	260	108	252	79
Recognized interest income	4	0	13	0
Interest Income On Impaired Loans Abstract
Interest income, Total	4	0	13	0
Real estate 1-4 family first mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	12,471	8,854	12,144	8,164
Recognized interest income	154	130	305	234
Interest Income On Impaired Loans Abstract
Interest income, Total	154	130	305	234
Real estate 1-4 family junior lien mortgage [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	1,903	1,411	1,826	1,414
Recognized interest income	20	18	34	31
Interest Income On Impaired Loans Abstract
Interest income, Total	20	18	34	31
Credit Card Receivable [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	587	274	579	226
Recognized interest income	6	5	12	6
Interest Income On Impaired Loans Abstract
Interest income, Total	6	5	12	6
Total Consumer [Member]
Impaired Loans, Average Recorded Investment [Abstract]
Average recorded investment	15,221	10,647	14,801	9,883
Recognized interest income	184	153	364	271
Interest Income On Impaired Loans Abstract
Interest income, Total	$ 184	$ 153	$ 364	$ 271