Allowance for Credit Losses (Aging Analysis of Past Due Loans and Leases) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Loans and Leases Excluding Covered Current	$ 94,377	[1],[2],[3]	$ 93,285	[1],[2],[3]
Loans and Leases Excluding Covered 30-89 Days Past Due	1,078	[1],[2],[3]	1,491	[1],[2],[3]
Loans and Leases Excluding Covered 90 Days Or More Past Due	365	[1],[2],[3]	448	[1],[2],[3]
Nonaccrual Loans and Leases Excluding Covered	2,061	[1],[2],[3]	2,149	[1],[2],[3]
Total Loans And Leases Excluding Covered Loans	97,881	[1],[2],[3]	97,373	[1],[2],[3]
Held for sale	1,965		3,697
Commercial and Industrial [Member]
Loans and Leases Excluding Covered Current	33,479	[1]	33,371	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	72	[1]	163	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due	4	[1]	8	[1]
Nonaccrual Loans and Leases Excluding Covered	611	[1],[2]	508	[1],[2]
Total Loans And Leases Excluding Covered Loans	34,166	[1]	34,050	[1]
Commercial Real Estate - Other [Member]
Loans and Leases Excluding Covered Current	10,628	[1]	10,962	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	35	[1]	68	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due	4	[1]	4	[1]
Nonaccrual Loans and Leases Excluding Covered	467	[1],[2]	405	[1],[2]
Total Loans And Leases Excluding Covered Loans	11,134	[1]	11,439	[1]
Commercial Real Estate - Residential ADC [Member]
Loans and Leases Excluding Covered Current	2,204	[1]	2,792	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	25	[1]	84	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due			8	[1]
Nonaccrual Loans and Leases Excluding Covered	460	[1],[2]	513	[1],[2]
Total Loans And Leases Excluding Covered Loans	2,689	[1]	3,397	[1]
Commercial Specialized Lending [Member]
Loans and Leases Excluding Covered Current	3,587	[1]	3,358	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	17	[1]	29	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due	7	[1]	5	[1]
Nonaccrual Loans and Leases Excluding Covered	11	[1],[2]	11	[1],[2]
Total Loans And Leases Excluding Covered Loans	3,622	[1]	3,403	[1]
Direct Retail Lending [Member]
Loans and Leases Excluding Covered Current	13,294	[1]	13,293	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	154	[1]	189	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due	59	[1]	76	[1]
Nonaccrual Loans and Leases Excluding Covered	172	[1],[2]	191	[1],[2]
Total Loans And Leases Excluding Covered Loans	13,679	[1]	13,749	[1]
Retail Revolving Credit [Member]
Loans and Leases Excluding Covered Current	2,053	[1]	2,079	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	22	[1]	28	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due	16	[1]	20	[1]
Total Loans And Leases Excluding Covered Loans	2,091	[1]	2,127	[1]
Retail Residential Mortgage [Member]
Loans and Leases Excluding Covered Current	17,324	[1],[3]	16,173	[1],[3]
Loans and Leases Excluding Covered 30-89 Days Past Due	504	[1],[3]	615	[1],[3]
Loans and Leases Excluding Covered 90 Days Or More Past Due	252	[1],[3]	296	[1],[3]
Nonaccrual Loans and Leases Excluding Covered	292	[1],[2],[3]	466	[1],[2],[3]
Total Loans And Leases Excluding Covered Loans	18,372	[1],[3]	17,550	[1],[3]
Retail Sales Finance [Member]
Loans and Leases Excluding Covered Current	7,140	[1]	6,922	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	68	[1]	95	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due	21	[1]	27	[1]
Nonaccrual Loans and Leases Excluding Covered	7	[1],[2]	6	[1],[2]
Total Loans And Leases Excluding Covered Loans	7,236	[1]	7,050	[1]
Retail Specialized Lending [Member]
Loans and Leases Excluding Covered Current	4,620	[1]	4,281	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due	181	[1]	219	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due			1	[1]
Nonaccrual Loans and Leases Excluding Covered	41	[1],[2]	49	[1],[2]
Total Loans And Leases Excluding Covered Loans	4,842	[1]	4,550	[1]
Covered and Other Acquired [Member]
Loans and Leases Excluding Covered Current	48	[1]	54	[1]
Loans and Leases Excluding Covered 30-89 Days Past Due			1	[1]
Loans and Leases Excluding Covered 90 Days Or More Past Due	2	[1]	3	[1]
Total Loans And Leases Excluding Covered Loans	50	[1]	58	[1]
Government Guaranteed Loans [Member]
Loans and Leases Excluding Covered 30-89 Days Past Due	78		83
Loans and Leases Excluding Covered 90 Days Or More Past Due	162		153
Nonaccrual Loans and Leases [Member]
Held for sale	$ 116		$ 521

[1] Covered loans have been excluded from this aging analysis because they are covered by FDIC loss sharing agreements, and their related allowance is determined by loan pool performance due to the application of the accretion method.

[2] Excludes nonperforming commercial loans held for sale of $116 million and $521 million as of June 30, 2011 and December 31, 2010, respectively.

[3] Residential mortgage loans include $78 million and $83 million in government guaranteed loans past due 30-89 days, and $162 million and $153 million in government guaranteed loans past due greater than 90 days as of June 30, 2011 and December 31, 2010, respectively.