Business Changes and Developments - Other (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			0 Months Ended			3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Global settlement on servicing and origination of mortgages [Member]	Feb. 09, 2012 Global settlement on servicing and origination of mortgages [Member] Mortgage Foreclosure Investigations and Litigation [Member] Settlement of Litigation, Cash Payments [Member]	Feb. 09, 2012 Global settlement on servicing and origination of mortgages [Member] Mortgage Foreclosure Investigations and Litigation [Member] Settlement of Litigation, Additional Relief Provided to Certain Borrowers [Member]	Feb. 09, 2012 Global settlement on servicing and origination of mortgages [Member] Mortgage Foreclosure Investigations and Litigation [Member] Settlement of Litigation, Refinancing Relief Provided to Certain Borrowers [Member]	Mar. 31, 2012 Washington Mutual, Inc. bankruptcy plan confirmation [Member]
Business changes and developments
Loss Contingency, Settlement Agreement, Consideration				1.1	3.7	500
Refinancing and borrower relief performance target to be met within two years			75.00%
Refinancing and borrower relief performance target to be met within three years			100.00%
Pre-tax gain on WAMU Global Settlement	$ 1,512	$ 574					$ 1,100