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Goodwill and Other Intangible Assets (Intangible Assets Subject to Amortization) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount $ 22,678   $ 22,678   $ 22,126
Accumulated amortization (11,162)   (11,162)   (10,263)
Net 11,516   11,516   11,863
Adjustments To Reflect Present Value Of Future Profits In Run Off Insurance Operations To Reflect Effects That Would Have Been Recognized Had Related Unrealized Investment Securities Holding Gains Loses Actually Been Realized 359   359   391
Amortization expense 359 436 1,079 1,266  
Customer Relationships [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 6,839   6,839   6,824
Accumulated amortization (2,088)   (2,088)   (1,814)
Net 4,751   4,751   5,010
Patents, Licenses And Trademarks [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 6,096   6,096   6,047
Accumulated amortization (2,548)   (2,548)   (2,312)
Net 3,548   3,548   3,735
Computer Software, Intangible Asset [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 7,324   7,324   6,791
Accumulated amortization (4,711)   (4,711)   (4,273)
Net 2,613   2,613   2,518
Leases, Acquired-in-Place [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 1,315   1,315   1,470
Accumulated amortization (881)   (881)   (944)
Net 434   434   526
Present Value Of Future Profits [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 524   524   491
Accumulated amortization (524)   (524)   (491)
Net 0   0   0
All Other [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 580   580   503
Accumulated amortization (410)   (410)   (429)
Net $ 170   $ 170   $ 74