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Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Financial Instruments [Line Items]    
Effect of including interest rate and currency derivatives on borrowings and bank deposits $ 4,710 $ 5,020
Reinsurance Recoverables 0 964
Loan Commitments By Notional Amount [Line Items]    
Ordinary course of business lending commitments 804 1,214
Excluded investment commitments 579 818
Inventory financing arrangements excluded 39 47
Commercial [Member]    
Loan Commitments By Notional Amount [Line Items]    
Unused revolving credit lines 2,054 2,908
Consumer Principally Credit Cards [Member]    
Loan Commitments By Notional Amount [Line Items]    
Unused revolving credit lines 321,710 306,188
Loan Commitments By Notional Amount [Member]    
Financial Instruments [Line Items]    
Notional Amount Of Life Insurance Benefit Net 0 1,843
Carrying amount (net) [Member]    
Financial Instruments [Line Items]    
Loans 78,775 115,889
Other commercial mortgages 1,392 1,427
Loans held for sale 22,651 778
Other financial instruments 161 122
Borrowings and bank deposits (271,944) (317,674)
Investment contract benefits (2,821) (2,970)
Guaranteed investment contracts (179) (1,000)
Liability for Future Policy Benefits, Life 0 (90)
Estimate of Fair Value Measurement [Member]    
Financial Instruments [Line Items]    
Loans 85,107 120,067
Other commercial mortgages 1,520 1,508
Loans held for sale 23,039 799
Other financial instruments 195 136
Borrowings and bank deposits (283,092) (333,956)
Investment contract benefits (3,327) (3,565)
Guaranteed investment contracts (193) (1,031)
Liability for Future Policy Benefits, Life 0 (77)
Accrued interest $ 1,994 $ 2,888