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Goodwill and Other Intangible Assets (Intangible Assets Subject to Amortization) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount $ 5,767   $ 5,767   $ 5,772
Accumulated amortization (4,324)   (4,324)   (4,226)
Net 1,443   1,443   1,546
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 366   366   391
Amortization expense 124 143 234 289  
Customer Relationships [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 1,201   1,201   1,186
Accumulated amortization (744)   (744)   (697)
Net 457   457   489
Patents, Licenses And Trademarks [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 237   237   250
Accumulated amortization (203)   (203)   (208)
Net 34   34   42
Computer Software, Intangible Asset [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 2,084   2,084   2,048
Accumulated amortization (1,647)   (1,647)   (1,597)
Net 437   437   451
Leases, Acquired-in-Place [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 1,443   1,443   1,470
Accumulated amortization (963)   (963)   (944)
Net 480   480   526
Present Value Of Future Profits [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 517   517   491
Accumulated amortization (517)   (517)   (491)
Net 0   0   0
All Other [Member]
         
Finite-Lived Intangible Assets [Line Items]          
Gross carrying amount 285   285   327
Accumulated amortization (250)   (250)   (289)
Net $ 35   $ 35   $ 38