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Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financial Instruments [Line Items]    
Effect of including interest rate and currency derivatives on borrowings and bank deposits $ 6,173 $ 7,937
Reinsurance Recoverables 1,250 2,000
Loan Commitments By Notional Amount [Line Items]    
Ordinary course of business lending commitments 3,329 3,708
Excluded investment commitments 1,440 1,276
Inventory financing arrangements excluded 12,066 12,813
Commitments Associated with Secured Financing Arrangements 10,970 12,923
Maximum Commitments Associated with Secured Financing Arrangements 14,503 15,731
Commercial [Member]
   
Loan Commitments By Notional Amount [Line Items]    
Unused revolving credit lines 15,818 17,929
Consumer Principally Credit Cards [Member]
   
Loan Commitments By Notional Amount [Line Items]    
Unused revolving credit lines 272,476 271,387
Loan Commitments By Notional Amount [Member]
   
Financial Instruments [Line Items]    
Insurance - credit life 2,284 2,277
Carrying amount (net) [Member]
   
Financial Instruments [Line Items]    
Loans 227,297 236,678
Other commercial mortgages 1,663 2,222
Loans held for sale 1,147 1,180
Other financial instruments 1,852 1,858
Borrowings and bank deposits (385,578) (397,300)
Investment contract benefits (3,277) (3,321)
Guaranteed investment contracts (1,580) (1,644)
Insurance - credit life (120) (120)
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Financial Instruments [Line Items]    
Loans 230,609 239,084
Other commercial mortgages 1,678 2,249
Loans held for sale 1,153 1,181
Other financial instruments 2,343 2,276
Borrowings and bank deposits (401,481) (414,533)
Investment contract benefits (4,030) (4,150)
Guaranteed investment contracts (1,596) (1,674)
Insurance - credit life $ (103) $ (104)