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Fair Value Measurement - Recurring Basis (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2012
Residential Mortgage [Member]
Dec. 31, 2011
Residential Mortgage [Member]
Dec. 31, 2011
Reverse Mortgage [Member]
Mar. 31, 2012
Residential Conforming Mortgage Intended for Sale to Government Agency [Member]
Dec. 31, 2011
Residential Conforming Mortgage Intended for Sale to Government Agency [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total debt and equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total debt and equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total debt instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total debt instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Mortgage-backed securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Mortgage-backed securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
US Government Corporations and Agencies Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
US Government Corporations and Agencies Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Residential mortgage [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Residential mortgage [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Commercial - nonagency [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Commercial - nonagency [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
U.S. Treasury and government agencies [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
U.S. Treasury and government agencies [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Obligations of U.S. states and municipalities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Obligations of U.S. states and municipalities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Certificates of Deposit [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Certificates of Deposit [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Non-U.S. government debt securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Non-U.S. government debt securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Corporate Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Loans
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Loans
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Asset-backed securities
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Asset-backed securities
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Collateralized loan obligations
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Collateralized loan obligations
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Other, Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Other, Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Equity securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Equity securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Other equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Other equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Physical commodities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Physical commodities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Credit Derivative [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Credit Derivative [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Interest rate
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Interest rate
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Credit derivatives
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Credit derivatives
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Foreign exchange
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Foreign exchange
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Equity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Equity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Commodity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Commodity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Private Equity Funds [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Private Equity Funds [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
All other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
All other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Total debt and equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Total debt and equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Total debt instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Total debt instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mortgage-backed securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mortgage-backed securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
US Government Corporations and Agencies Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
US Government Corporations and Agencies Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Residential mortgage [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Residential mortgage [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Commercial - nonagency [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Commercial - nonagency [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. Treasury and government agencies [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. Treasury and government agencies [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Obligations of U.S. states and municipalities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Obligations of U.S. states and municipalities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Certificates of Deposit [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Certificates of Deposit [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Non-U.S. government debt securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Non-U.S. government debt securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Corporate Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Loans
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Loans
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Asset-backed securities
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Asset-backed securities
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Collateralized loan obligations
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Collateralized loan obligations
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Other, Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Other, Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Equity securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Equity securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Other equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Other equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Physical commodities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Physical commodities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Credit Derivative [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Credit Derivative [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Interest rate
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Interest rate
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Credit derivatives
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Credit derivatives
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Foreign exchange
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Foreign exchange
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Equity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Equity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Commodity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Commodity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Total other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Total other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Private Equity Funds [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Private Equity Funds [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
All other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
All other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Total debt and equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Total debt and equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Total debt instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Total debt instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mortgage-backed securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mortgage-backed securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
US Government Corporations and Agencies Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
US Government Corporations and Agencies Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Residential mortgage [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Residential mortgage [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Commercial - nonagency [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Commercial - nonagency [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. Treasury and government agencies [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. Treasury and government agencies [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Obligations of U.S. states and municipalities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Obligations of U.S. states and municipalities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Certificates of Deposit [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Certificates of Deposit [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Non-U.S. government debt securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Non-U.S. government debt securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Corporate Debt Securities [Member]
Mar. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Loans
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Loans
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Loans
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Asset-backed securities
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Asset-backed securities
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Collateralized loan obligations
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Collateralized loan obligations
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Other, Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Other, Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Equity securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Equity securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Other equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Other equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Physical commodities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Physical commodities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Credit Derivative [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Credit Derivative [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Interest rate
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Interest rate
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Credit derivatives
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Credit derivatives
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Foreign exchange
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Foreign exchange
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Equity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Equity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Commodity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Commodity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Total other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Total other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Private Equity Funds [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Private Equity Funds [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
All other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
All other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Total debt and equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Total debt and equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Total debt instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Total debt instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage-backed securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage-backed securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
US Government Corporations and Agencies Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
US Government Corporations and Agencies Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Residential mortgage [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Residential mortgage [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Commercial - nonagency [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Commercial - nonagency [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. Treasury and government agencies [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. Treasury and government agencies [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Obligations of U.S. states and municipalities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Obligations of U.S. states and municipalities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Certificates of Deposit [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Certificates of Deposit [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Non-U.S. government debt securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Non-U.S. government debt securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Corporate Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Reverse Mortgage [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Asset-backed securities
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Asset-backed securities
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Collateralized loan obligations
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Collateralized loan obligations
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other, Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other, Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Physical commodities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Physical commodities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Credit Derivative [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Credit Derivative [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Interest rate
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Interest rate
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Credit derivatives
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Credit derivatives
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Foreign exchange
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Foreign exchange
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Commodity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Commodity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Total other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Total other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Private Equity Funds [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Private Equity Funds [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
All other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
All other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Total debt and equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Total debt and equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Total debt instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Total debt instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Mortgage-backed securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Mortgage-backed securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
US Government Corporations and Agencies Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
US Government Corporations and Agencies Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Residential mortgage [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Residential mortgage [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Commercial - nonagency [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Commercial - nonagency [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
U.S. Treasury and government agencies [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
U.S. Treasury and government agencies [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Obligations of U.S. states and municipalities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Obligations of U.S. states and municipalities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Certificates of Deposit [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Certificates of Deposit [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Non-U.S. government debt securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Non-U.S. government debt securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Corporate Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Loans
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Loans
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Asset-backed securities
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Asset-backed securities
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Collateralized loan obligations
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Collateralized loan obligations
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Other, Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Other, Debt Securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Equity securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Equity securities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Other equity instruments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Other equity instruments [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Physical commodities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Physical commodities [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Credit Derivative [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Credit Derivative [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Interest rate
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Interest rate
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Credit derivatives
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Credit derivatives
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Foreign exchange
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Foreign exchange
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Equity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Equity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Commodity
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Commodity
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Total other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Total other assets [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Private Equity Funds [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Private Equity Funds [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
All other assets [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
All other assets [Member]
Mar. 31, 2012
Trading assets
Wholesale
Dec. 31, 2011
Trading assets
Wholesale
Mar. 31, 2012
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2012
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Total other assets [Member]
Dec. 31, 2011
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Total other assets [Member]
Assets and liabilities measured at fair value on a recurring basis [Abstract]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Federal funds sold and securities purchased under resale                                                                                                                                   $ 0 $ 0                                                                                                                 $ 26,259,000,000 $ 24,891,000,000                                                                                                                   $ 0 $ 0                                                                                                                   $ 0 $ 0                                                                                                                            
Federal funds sold and securities purchased under resale agreements (included $26,259 and $24,891 at fair value) 240,484,000,000 235,314,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       26,259,000,000 24,891,000,000    
Securities borrowed                                                                                                                                   0 0                                                                                                                 12,519,000,000 15,308,000,000                                                                                                                   0 0                                                                                                                   0 0                                                                                                                            
Securities Borrowed 135,650,000,000 142,462,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       12,519,000,000 15,308,000,000    
Trading assets         19,800,000,000 20,100,000,000 4,000,000,000 10,800,000,000 11,000,000,000 456,000,000,000 443,963,000,000 370,623,000,000 351,486,000,000 234,121,000,000 223,881,000,000 34,985,000,000 41,349,000,000 29,249,000,000 34,969,000,000 3,452,000,000 3,752,000,000 2,284,000,000 2,628,000,000 26,959,000,000 19,899,000,000 17,556,000,000 16,736,000,000 4,456,000,000 2,615,000,000     64,515,000,000 58,802,000,000 41,772,000,000 40,311,000,000 32,505,000,000 33,798,000,000 11,373,000,000 10,371,000,000         116,037,000,000 98,478,000,000 3,296,000,000 3,163,000,000 17,169,000,000 25,964,000,000 85,377,000,000 92,477,000,000 41,520,000,000 46,369,000,000 6,625,000,000 6,684,000,000 13,056,000,000 17,890,000,000 8,995,000,000 6,793,000,000 15,181,000,000 14,741,000,000         193,170,000,000 178,791,000,000 191,303,000,000 172,073,000,000 68,249,000,000 57,208,000,000 23,458,000,000 27,082,000,000 23,458,000,000 27,082,000,000 0 0 0 0 20,011,000,000 11,508,000,000 0 0 0 0     24,780,000,000 18,618,000,000 0 0 0 0 0 0         111,450,000,000 93,799,000,000 0 0 11,604,000,000 21,066,000,000 1,867,000,000 6,718,000,000 782,000,000 1,324,000,000 0 0 718,000,000 833,000,000 0 0 367,000,000 4,561,000,000             1,760,035,000,000 1,989,186,000,000 148,981,000,000 146,446,000,000 137,774,000,000 135,763,000,000 9,298,000,000 11,627,000,000 5,712,000,000 7,801,000,000 2,753,000,000 2,956,000,000 833,000,000 870,000,000 6,948,000,000 8,391,000,000 15,809,000,000 15,117,000,000 4,456,000,000 2,615,000,000     39,654,000,000 40,080,000,000 36,309,000,000 33,938,000,000   21,361,000,000 21,589,000,000 3,939,000,000 2,406,000,000         3,339,000,000 3,502,000,000 2,303,000,000 2,283,000,000 5,565,000,000 4,898,000,000 1,611,054,000,000 1,842,740,000,000 1,259,624,000,000 1,433,469,000,000 114,759,000,000 152,569,000,000 136,858,000,000 162,689,000,000 44,317,000,000 43,604,000,000 55,496,000,000 50,409,000,000             59,869,000,000 68,008,000,000 30,339,000,000 32,967,000,000 28,098,000,000 30,910,000,000 2,229,000,000 2,640,000,000 79,000,000 86,000,000 699,000,000 796,000,000 1,451,000,000 1,758,000,000 0 0 1,747,000,000 1,619,000,000 0 0     81,000,000 104,000,000 5,463,000,000 6,373,000,000 11,144,000,000 12,209,000,000 3,900,000,000 7,434,000,000 7,965,000,000 5,800,000,000       1,248,000,000 1,177,000,000 993,000,000 880,000,000 0 0 29,530,000,000 35,041,000,000 6,129,000,000 6,728,000,000 11,796,000,000 17,081,000,000 4,039,000,000 4,641,000,000 5,054,000,000 4,132,000,000 2,512,000,000 2,459,000,000             (1,557,074,000,000) (1,792,022,000,000) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0     0 0 0 0 0 0 0 0         0 0 0 0 0 0 (1,557,074,000,000) (1,792,022,000,000) (1,225,015,000,000) (1,395,152,000,000) (119,930,000,000) (162,966,000,000) (128,559,000,000) (150,273,000,000) (40,376,000,000) (40,943,000,000) (43,194,000,000) (42,688,000,000)             2,400,000,000 2,000,000,000        
Available-for-sale securities                               193,426,000,000 185,893,000,000 104,318,000,000 107,107,000,000 77,542,000,000 67,557,000,000 11,566,000,000 11,229,000,000 11,767,000,000 8,351,000,000 19,342,000,000 16,540,000,000     3,044,000,000 3,017,000,000 52,687,000,000 45,265,000,000 60,395,000,000 62,176,000,000         25,239,000,000 24,861,000,000 13,326,000,000 15,973,000,000 2,505,000,000 2,705,000,000                                         130,044,000,000 124,347,000,000         90,898,000,000 92,426,000,000 90,898,000,000 92,426,000,000 0 0 0 0 8,084,000,000 3,837,000,000 36,000,000 36,000,000     0 0 28,559,000,000 25,381,000,000 0 0         0 0 0 0 2,467,000,000 2,667,000,000                                             225,770,000,000 214,948,000,000         102,317,000,000 93,197,000,000 13,420,000,000 14,681,000,000 77,511,000,000 67,554,000,000 11,386,000,000 10,962,000,000 3,683,000,000 4,514,000,000 19,048,000,000 16,246,000,000     3,044,000,000 3,017,000,000 24,128,000,000 19,884,000,000 60,395,000,000 62,176,000,000           0 116,000,000 13,117,000,000 15,760,000,000 38,000,000 38,000,000                                             25,917,000,000 25,486,000,000         211,000,000 270,000,000 0 0 31,000,000 3,000,000 180,000,000 267,000,000 0 0 258,000,000 258,000,000     0 0 0 0 0 0           25,239,000,000 24,745,000,000 209,000,000 213,000,000 0 0                                             0 0         0 0 0 0 0 0 0 0 0 0 0 0     0 0 0 0 0 0         0 0 0 0 0 0                                                 381,731,000,000 364,781,000,000    
Loans, at fair value                                                                                                                                   0 0                                                                                                                 522,000,000 450,000,000                                                                                                                   1,766,000,000 1,647,000,000                                                                                                                   0 0                                                                                                                     2,288,000,000 2,097,000,000    
Mortgage servicing rights 8,039,000,000 7,223,000,000 13,093,000,000 13,649,000,000           8,039,000,000 7,223,000,000                                                                                                             0 0                                                                                                                 0 0                                                                                                                   8,039,000,000 7,223,000,000                                                                                                                   0 0                                                                                                                            
Total other assets                                                                                                                           7,628,000,000 7,556,000,000 9,493,000,000 8,943,000,000                                                                                                         5,183,000,000 4,435,000,000 316,000,000 99,000,000 4,867,000,000 4,336,000,000                                                                                                           802,000,000 939,000,000 573,000,000 706,000,000 229,000,000 233,000,000                                                                                                           11,136,000,000 11,125,000,000 6,739,000,000 6,751,000,000 4,397,000,000 4,374,000,000                                                                                                         0 0 0 0 0 0            
Other assets, at fair value 102,625,000,000 104,131,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           17,121,000,000 16,499,000,000
Total assets measured at fair value on a recurring basis                   903,957,000,000 874,762,000,000                                                                                                             328,397,000,000 307,573,000,000                                                                                                                 2,025,907,000,000 2,245,722,000,000                                                                                                                   106,727,000,000 113,489,000,000                                                                                                                   (1,557,074,000,000) (1,792,022,000,000)                                                                                                                            
Deposits                                                                                                                                   0 0                                                                                                                 3,617,000,000 3,515,000,000                                                                                                                   1,651,000,000 1,418,000,000                                                                                                                   0 0                                                                                                                            
Deposits, at fair value 1,128,512,000,000 1,127,806,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       5,268,000,000 4,933,000,000    
Federal funds purchased and securities loaned or sold under repurchase agreements                                                                                                                                   0 0                                                                                                                 13,241,000,000 9,517,000,000                                                                                                                   0 0                                                                                                                   0 0                                                                                                                            
Federal funds purchased and securities loaned or sold under repurchase agreements, at fair value 250,483,000,000 213,532,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       13,241,000,000 9,517,000,000    
Other borrowed funds                                                                                                                                   0 0                                                                                                                 8,920,000,000 8,069,000,000                                                                                                                   1,233,000,000 1,507,000,000                                                                                                                   0 0                                                                                                                            
Federal Home Loan Bank Advances And Other Short Term Borrowings 27,298,000,000 21,908,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       10,153,000,000 9,576,000,000    
Trading liabilities                   146,003,000,000 141,695,000,000 71,529,000,000 66,718,000,000                                                                         74,474,000,000 74,977,000,000 24,235,000,000 28,010,000,000 6,703,000,000 5,610,000,000 15,534,000,000 17,435,000,000 12,909,000,000 9,655,000,000 15,093,000,000 14,267,000,000         58,325,000,000 56,327,000,000 56,596,000,000 50,830,000,000                                                                         1,729,000,000 5,497,000,000 698,000,000 1,537,000,000 0 0 767,000,000 846,000,000 0 0 264,000,000 3,114,000,000             1,600,123,000,000 1,818,633,000,000 14,660,000,000 15,677,000,000                                                                           1,585,463,000,000 1,802,956,000,000 1,220,935,000,000 1,395,113,000,000 117,998,000,000 155,772,000,000 147,519,000,000 159,258,000,000 41,903,000,000 39,129,000,000 57,108,000,000 53,684,000,000             26,246,000,000 29,014,000,000 273,000,000 211,000,000                                                                           25,973,000,000 28,803,000,000 2,891,000,000 3,167,000,000 6,988,000,000 9,349,000,000 5,099,000,000 5,904,000,000 7,883,000,000 7,237,000,000 3,112,000,000 3,146,000,000             (1,538,691,000,000) (1,762,279,000,000) 0 0                                                                         (1,538,691,000,000) (1,762,279,000,000) (1,200,289,000,000) (1,371,807,000,000) (118,283,000,000) (159,511,000,000) (137,851,000,000) (148,573,000,000) (36,877,000,000) (36,711,000,000) (45,391,000,000) (45,677,000,000)                        
Accounts payable and other liabilities                                                                                                                                   0 0                                                                                                                 0 0                                                                                                                   46,000,000 51,000,000                                                                                                                   0 0                                                                                                                            
Accounts Payable and Other Accrued Liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           46,000,000 51,000,000    
Beneficial interests issued by consolidated VIEs, at fair value                                                                                                                                   0 0                                                                                                                 160,000,000 459,000,000                                                                                                                   841,000,000 791,000,000                                                                                                                   0 0                                                                                                                            
Beneficial interest liability, at fair value 67,750,000,000 65,977,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       1,001,000,000 1,250,000,000    
Long-term debt                                                                                                                                   0 0                                                                                                                 25,920,000,000 24,410,000,000                                                                                                                   9,553,000,000 10,310,000,000                                                                                                                   0 0                                                                                                                            
Long Term Debt Borrowings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           35,473,000,000 34,720,000,000    
Total liabilities at fair value on a recurring basis                   211,185,000,000 201,742,000,000                                                                                                             58,325,000,000 56,327,000,000                                                                                                                 1,651,981,000,000 1,864,603,000,000                                                                                                                   39,570,000,000 43,091,000,000                                                                                                                   (1,538,691,000,000) (1,762,279,000,000)                                                                                                                            
Fair value assets and liabilities measured on recurring basis - supplemental data                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Total U.S. government-sponsored enterprise obligations 112,900,000,000 122,400,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Reduction In Level Three Derivative Receivable And Derivative Payable Balances 10,400,000,000 11,700,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Costs of the private equity investment portfolio 9,200,000,000 9,500,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Investment valued at net asset value                   5,100,000,000 5,500,000,000                                                                                                                                                                                                                                 1,100,000,000 1,200,000,000                                                                                                                   4,000,000,000 4,300,000,000                                                                                                                                                                                                                                                  
Fair Value Level Three To Level Two Transfers Amount                                                                                                                                                                                                                                                                                                           $ 1,200,000,000