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Fair Value Measurement - Recurring Basis (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 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]
Dec. 31, 2012
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
US Government Corporations and Agencies Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Residential mortgage [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Mortgage-backed securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Certificates Of Deposit Bankers Acceptances Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Collateralized Loan Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Loans
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Loans
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Loans
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Loans
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Loans
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Loans
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Loans
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Loans
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Loans
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Loans
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Debt Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Equity securities [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Commodities Investment [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Other equity instruments [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Debt and Equity Instruments [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Interest rate
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Interest rate
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Interest rate
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Interest rate
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Interest rate
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Interest rate
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Interest rate
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Interest rate
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Interest rate
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Interest rate
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Credit derivatives
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Foreign exchange
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Equity
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Equity
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Equity
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Equity
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Equity
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Equity
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Equity
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Equity
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Equity
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Equity
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Commodity
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Commodity
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Commodity
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Commodity
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Commodity
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Commodity
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Commodity
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Commodity
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Commodity
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Commodity
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Derivative [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Private Equity Funds [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
All Other Asset Classes [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2011
Other Assets [Member]
Fair Value, Measurements, Recurring [Member]
Netting adjustments [Member]
Dec. 31, 2012
Other Assets [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Other Assets [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Residential Mortgage [Member]
Dec. 31, 2011
Residential Mortgage [Member]
Dec. 31, 2012
Commercial Loan [Member]
Trading assets
Dec. 31, 2011
Commercial Loan [Member]
Trading assets
Dec. 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]
Dec. 31, 2012
Reverse Mortgage [Member]
Dec. 31, 2011
Reverse Mortgage [Member]
Dec. 31, 2012
Long-term debt
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Long-term debt
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure             $ 0 $ 0 $ 24,258,000,000 $ 22,191,000,000 $ 0 $ 0 $ 0 $ 0 $ 24,258,000,000 $ 22,191,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Securities borrowed             0 0 10,177,000,000 15,308,000,000 0 0 0 0 10,177,000,000 15,308,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Assets and liabilities measured at fair value on a recurring basis [Abstract]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Trading assets         450,028,000,000 443,963,000,000 153,987,000,000 178,791,000,000 1,834,541,000,000 1,989,186,000,000 48,897,000,000 68,008,000,000 (1,587,397,000,000) (1,792,022,000,000)     36,738,000,000 34,969,000,000 0 27,082,000,000 36,240,000,000 7,801,000,000 498,000,000 86,000,000 0 0 2,172,000,000 3,752,000,000 0 0 1,509,000,000 2,956,000,000 663,000,000 796,000,000 0 0 2,772,000,000 2,628,000,000 0 0 1,565,000,000 870,000,000 1,207,000,000 1,758,000,000 0 0 41,682,000,000 41,349,000,000 0 27,082,000,000 39,314,000,000 11,627,000,000 2,368,000,000 2,640,000,000 0 0 22,425,000,000 19,899,000,000 12,240,000,000 11,508,000,000 10,185,000,000 8,391,000,000 0 0 0 0 18,162,000,000 16,736,000,000 0 0 16,726,000,000 15,117,000,000 1,436,000,000 1,619,000,000 0 0 4,759,000,000 2,615,000,000 0 0 4,759,000,000 2,615,000,000 0 0 0 0                     68,688,000,000 58,802,000,000 23,500,000,000 18,618,000,000 45,121,000,000 40,080,000,000 67,000,000 104,000,000 0 0 38,692,000,000 40,311,000,000 0 0 33,384,000,000 33,938,000,000 5,308,000,000 6,373,000,000 0 0             2,100,000,000                           41,541,000,000 33,798,000,000 0 0 30,754,000,000 21,589,000,000 10,787,000,000 12,209,000,000 0 0 7,878,000,000 10,371,000,000 0 0 4,182,000,000 2,406,000,000 3,696,000,000 7,965,000,000 0 0 243,827,000,000 223,881,000,000 35,740,000,000 57,208,000,000 184,425,000,000 135,763,000,000 23,662,000,000 30,910,000,000 0 0 110,699,000,000 98,478,000,000 106,898,000,000 93,799,000,000 2,687,000,000 3,502,000,000 1,114,000,000 1,177,000,000 0 0 16,173,000,000 25,964,000,000 10,107,000,000 21,066,000,000 6,066,000,000 4,898,000,000 0 0 0 0 4,346,000,000 3,163,000,000 0 0 3,483,000,000 2,283,000,000 863,000,000 880,000,000 0 0 375,045,000,000 351,486,000,000 152,745,000,000 172,073,000,000 196,661,000,000 146,446,000,000 25,639,000,000 32,967,000,000 0 0 39,205,000,000 46,369,000,000 476,000,000 1,324,000,000 1,322,155,000,000 1,433,469,000,000 6,617,000,000 6,728,000,000 (1,290,043,000,000) (1,395,152,000,000) 1,735,000,000 6,684,000,000 0 0 93,821,000,000 152,569,000,000 6,489,000,000 17,081,000,000 (98,575,000,000) (162,966,000,000) 14,142,000,000 17,890,000,000 450,000,000 833,000,000 144,758,000,000 162,689,000,000 3,051,000,000 4,641,000,000 (134,117,000,000) (150,273,000,000) 9,266,000,000 6,793,000,000 0 0 36,017,000,000 43,604,000,000 4,921,000,000 4,132,000,000 (31,672,000,000) (40,943,000,000) 10,635,000,000 14,741,000,000 316,000,000 4,561,000,000 41,129,000,000 50,409,000,000 2,180,000,000 2,459,000,000 (32,990,000,000) (42,688,000,000) 74,983,000,000 92,477,000,000 1,242,000,000 6,718,000,000 1,637,880,000,000 1,842,740,000,000 23,258,000,000 35,041,000,000 (1,587,397,000,000) (1,792,022,000,000)                                                                 26,400,000,000 20,100,000,000 2,200,000,000 2,000,000,000 17,400,000,000 11,000,000,000 4,000,000,000 4,000,000,000    
Available-for-sale securities             52,893,000,000 124,347,000,000 289,336,000,000 214,948,000,000 28,916,000,000 25,486,000,000 0 0 371,145,000,000 364,781,000,000 98,388,000,000 107,107,000,000 0 92,426,000,000 98,388,000,000 14,681,000,000 0 0 0 0 74,639,000,000 67,557,000,000 0 0 74,189,000,000 67,554,000,000 450,000,000 3,000,000 0 0 13,203,000,000 11,229,000,000 0 0 12,948,000,000 10,962,000,000 255,000,000 267,000,000 0 0 186,230,000,000 185,893,000,000 0 92,426,000,000 185,525,000,000 93,197,000,000 705,000,000 270,000,000 0 0 12,130,000,000 8,351,000,000 8,907,000,000 3,837,000,000 3,223,000,000 4,514,000,000 0 0 0 0 21,711,000,000 16,540,000,000 35,000,000 36,000,000 21,489,000,000 16,246,000,000 187,000,000 258,000,000 0 0                     2,783,000,000 3,017,000,000 0 0 2,783,000,000 3,017,000,000 0 0 0 0 66,044,000,000 45,265,000,000 41,218,000,000 25,381,000,000 24,826,000,000 19,884,000,000 0 0 0 0 38,609,000,000 62,176,000,000 0 0 38,609,000,000 62,176,000,000 0 0 0 0 27,896,000,000 24,861,000,000 0 0 0 116,000,000 27,896,000,000 24,745,000,000 0 0 12,971,000,000 15,973,000,000 0 0 12,843,000,000 15,760,000,000 128,000,000 213,000,000 0 0                                                             2,771,000,000 2,705,000,000 2,733,000,000 2,667,000,000 38,000,000 38,000,000 0 0 0 0                                                                                                                                                                                                                                                                        
Loans, at fair value             0 0 273,000,000 450,000,000 2,282,000,000 1,647,000,000 0 0 2,555,000,000 2,097,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Mortgage servicing rights 7,614,000,000 7,223,000,000 13,649,000,000 15,531,000,000 7,614,000,000 7,223,000,000 0 0 0 0 7,614,000,000 7,223,000,000 0 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
Other Assets, Fair Value Disclosure                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     7,759,000,000 7,556,000,000 578,000,000 99,000,000 0 706,000,000 7,181,000,000 6,751,000,000 0 0 8,699,000,000 8,943,000,000 4,188,000,000 4,336,000,000 253,000,000 233,000,000 4,258,000,000 4,374,000,000 0 0 4,766,000,000 4,435,000,000 253,000,000 939,000,000 11,439,000,000 11,125,000,000 0 0 16,458,000,000 16,499,000,000                        
Total assets measured at fair value on a recurring basis         882,235,000,000 872,062,000,000 211,646,000,000 307,573,000,000 2,158,838,000,000 2,243,022,000,000 99,148,000,000 113,489,000,000 (1,587,397,000,000) (1,792,022,000,000)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     119,400,000,000 122,400,000,000                    
Deposits             0 0 3,750,000,000 3,515,000,000 1,983,000,000 1,418,000,000 0 0 5,733,000,000 4,933,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Federal funds purchased and securities loaned or sold under repurchase agreements             0 0 4,388,000,000 6,817,000,000 0 0 0 0 4,388,000,000 6,817,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Other Short-term Borrowings 26,636,000,000 21,908,000,000         0 0 9,972,000,000 8,069,000,000 1,619,000,000 1,507,000,000 0 0 11,591,000,000 9,576,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Trading liabilities         131,918,000,000 141,695,000,000 47,674,000,000 56,327,000,000 1,631,576,000,000 1,818,633,000,000 21,570,000,000 29,014,000,000 (1,568,902,000,000) (1,762,279,000,000)                                                                                                                                                                                                                                                                                                                                                                             61,262,000,000 66,718,000,000 46,580,000,000 50,830,000,000 14,477,000,000 15,677,000,000 205,000,000 211,000,000 0 0 24,906,000,000 28,010,000,000 490,000,000 1,537,000,000 1,283,829,000,000 1,395,113,000,000 3,295,000,000 3,167,000,000 (1,262,708,000,000) (1,371,807,000,000) 2,504,000,000 5,610,000,000 0 0 95,411,000,000 155,772,000,000 4,616,000,000 9,349,000,000 (97,523,000,000) (159,511,000,000) 18,601,000,000 17,435,000,000 428,000,000 846,000,000 156,413,000,000 159,258,000,000 4,801,000,000 5,904,000,000 (143,041,000,000) (148,573,000,000) 11,819,000,000 9,655,000,000 0 0 36,083,000,000 39,129,000,000 6,727,000,000 7,237,000,000 (30,991,000,000) (36,711,000,000) 12,826,000,000 14,267,000,000 176,000,000 3,114,000,000 45,363,000,000 53,684,000,000 1,926,000,000 3,146,000,000 (34,639,000,000) (45,677,000,000) 70,656,000,000 74,977,000,000 1,094,000,000 5,497,000,000 1,617,099,000,000 1,802,956,000,000 21,365,000,000 28,803,000,000 (1,568,902,000,000) (1,762,279,000,000)                                                                                    
Accounts payable and other liabilities             0 0 0 0 36,000,000 51,000,000 0 0 36,000,000 51,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Beneficial interests issued by consolidated VIEs, at fair value             0 0 245,000,000 459,000,000 925,000,000 791,000,000 0 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
Long-term debt             0 0 22,312,000,000 24,410,000,000 8,476,000,000 10,310,000,000 0 0 30,788,000,000 34,720,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Liabilities Fair Value Disclosure         185,624,000,000 199,042,000,000 47,674,000,000 56,327,000,000 1,672,243,000,000 1,861,903,000,000 34,609,000,000 43,091,000,000 (1,568,902,000,000) (1,762,279,000,000)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
Fair value assets and liabilities measured on recurring basis - supplemental data                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Reduction In Level Three Derivative Receivable And Derivative Payable Balances 8,400,000,000 11,700,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Costs of the private equity investment portfolio 8,400,000,000 9,500,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Investment valued at net asset value         4,900,000,000 5,500,000,000     1,100,000,000 1,200,000,000 3,800,000,000 4,300,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount                                         113,900,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Fair Value Level Three To Level Two Transfers Amount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 $ 1,200,000,000                                                                                                                                   $ 1,800,000,000 $ 2,600,000,000