Asset Quality (Details 3) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	$ 47,840
Commercial, financial and agricultural [Member] | AAA-AA [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	100	96
AAA-AA [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	760	723
AAA-AA [Member] | RE -Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	2	2
AAA-AA [Member] | RE- Construction [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	3	0
AAA-AA [Member] | Commercial Lease [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	655	625
Commercial, financial and agricultural [Member] | A [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	671	820
A [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	1,980	2,034
A [Member] | RE -Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	63	23
A [Member] | RE- Construction [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	1	7
A [Member] | Commercial Lease [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	1,245	1,184
Commercial, financial and agricultural [Member] | BBB-BB [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	13,546	11,655
BBB-BB [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	23,436	22,985
BBB-BB [Member] | RE -Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	5,553	6,336
BBB-BB [Member] | RE- Construction [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	747	1,116
BBB-BB [Member] | Commercial Lease [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	3,590	3,878
Commercial, financial and agricultural [Member] | B [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	955	1,418
B [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	2,501	3,986
B [Member] | RE -Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	941	1,236
B [Member] | RE- Construction [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	262	768
B [Member] | Commercial Lease [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	343	564
Commercial, financial and agricultural [Member] | CCC-C [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	1,611	3,124
CCC-C [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	4,011	7,406
CCC-C [Member] | RE -Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	1,510	2,374
CCC-C [Member] | RE- Construction [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	618	1,539
CCC-C [Member] | Commercial Lease [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	272	369
Commercial, financial and agricultural [Member] | Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	16,883	17,113
Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	32,688	37,134
Commercial [Member] | RE -Commercial [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	8,069	9,971
Commercial [Member] | RE- Construction [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	1,631	3,430
Commercial [Member] | Commercial Lease [Member]
Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category
Total Loans	$ 6,105	$ 6,620