Purchased Credit Impaired Loans by Delinquency Status, Commercial (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
90+ DPD and accruing	$ 17,318	$ 18,488
Purchased Credit Impaired Loans	38,693	41,430
Commercial and Industrial Loans [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Purchased Credit Impaired Loans	527	718
Commercial and Industrial Loans [Member] | Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Current-29 DPD	434	612
30-89 DPD and accruing	33	22
90+ DPD and accruing	60	84
Purchased Credit Impaired Loans	527	718
Commercial Real Estate Mortgage [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Purchased Credit Impaired Loans	2,800	2,855
Commercial Real Estate Mortgage [Member] | Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Current-29 DPD	2,420	2,295
30-89 DPD and accruing	82	113
90+ DPD and accruing	298	447
Purchased Credit Impaired Loans	2,800	2,855
Commercial Real Estate Construction [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Purchased Credit Impaired Loans	2,188	2,949
Commercial Real Estate Construction [Member] | Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Current-29 DPD	1,182	1,395
30-89 DPD and accruing	166	178
90+ DPD and accruing	840	1,376
Purchased Credit Impaired Loans	2,188	2,949
Foreign Loans [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Purchased Credit Impaired Loans	1,501	1,413
Foreign Loans [Member] | Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Current-29 DPD	1,281	1,209
30-89 DPD and accruing	0	0
90+ DPD and accruing	220	204
Purchased Credit Impaired Loans	1,501	1,413
Total Commercial [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Purchased Credit Impaired Loans	7,016	7,935
Total Commercial [Member] | Purchased Credit-Impaired Loans [Member]
Purchased Credit Impaired Loans Commercial Days Past Due [Abstract]
Current-29 DPD	5,317	5,511
30-89 DPD and accruing	281	313
90+ DPD and accruing	1,418	2,111
Purchased Credit Impaired Loans	$ 7,016	$ 7,935