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Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financial Instruments [Line Items]    
Insurance - credit life $ (20,427) $ (19,257)
Effect of including interest rate and currency derivatives on borrowings and bank deposits 7,937 9,051
Reinsurance Recoverables 2,000 2,000
Loan Commitments By Notional Amount [Line Items]    
Ordinary course of business lending commitments 3,708 3,756
Excluded investment commitments 1,276 2,064
Inventory financing arrangements excluded 12,813 12,354
Commitments Associated with Secured Financing Arrangements 12,923 14,057
Maximum Commitments Associated with Secured Financing Arrangements 15,731 17,344
Commercial [Member]
   
Loan Commitments By Notional Amount [Line Items]    
Unused revolving credit lines 17,929 18,757
Consumer Principally Credit Cards [Member]
   
Loan Commitments By Notional Amount [Line Items]    
Unused revolving credit lines 271,387 257,646
Loan Commitments By Notional Amount [Member]
   
Financial Instruments [Line Items]    
Insurance - credit life 2,277 1,944
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Financial Instruments [Line Items]    
Loans 239,084 251,433
Other commercial mortgages 2,249 1,537
Loans held for sale 1,181 497
Other financial instruments 2,276 2,534
Borrowings and bank deposits (414,533) (449,403)
Investment contract benefits (4,150) (4,240)
Guaranteed investment contracts (1,674) (4,266)
Insurance - credit life (104) (88)
Carrying Amount Net [Member]
   
Financial Instruments [Line Items]    
Loans 236,678 250,999
Other commercial mortgages 2,222 1,494
Loans held for sale 1,180 496
Other financial instruments 1,858 2,071
Borrowings and bank deposits (397,300) (443,097)
Investment contract benefits (3,321) (3,493)
Guaranteed investment contracts (1,644) (4,226)
Insurance - credit life $ (120) $ (106)