Asset Quality (Details 4) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010
Consumer Credit Exposure Credit Risk Profile by Regulatory Classifications
Credit Risk Profile Based on Payment	$ 47,840
Residential, Prime, Financing Receivable [Member] | Pass [Member]
Consumer Credit Exposure Credit Risk Profile by Regulatory Classifications
Credit Risk Profile Based on Payment	11,644	12,122
Residential, Prime, Financing Receivable [Member] | Special Mention [Member]
Consumer Credit Exposure Credit Risk Profile by Regulatory Classifications
Credit Risk Profile Based on Payment	0	0
Residential, Prime, Financing Receivable [Member] | Substandard [Member]
Consumer Credit Exposure Credit Risk Profile by Regulatory Classifications
Credit Risk Profile Based on Payment	220	252
Residential, Prime, Financing Receivable [Member]
Consumer Credit Exposure Credit Risk Profile by Regulatory Classifications
Credit Risk Profile Based on Payment	$ 11,864	$ 12,374