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Acquisitions and Dispositions (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Nov. 01, 2010
Acquisitions and Dispositions [Abstract]      
Total cash paid and securities issued to AM Holdings     $ 15,994
Contractual purchase price adjustments     396
Total purchase price for acquisition     16,390
Effective settlement of pre-existing relationships     (186)
Contingent consideration 109   88
Fair Value of Purchase Price      
Value of securities issued for business acquisition   3,000 9,200
Common Stock
     
Fair Value of Purchase Price      
Value of securities issued for business acquisition     3,200
Convertible Preferred Stock
     
Fair Value of Purchase Price      
Value of securities issued for business acquisition     2,805
Equity Units
     
Fair Value of Purchase Price      
Value of securities issued for business acquisition     3,189
American Life Insurance Company ("American Life") and Delaware American Life Insurance ("DelAm") [Member]
     
Fair Value of Purchase Price      
Cash     6,800
Total purchase consideration for ALICO     16,292
American Life Insurance Company ("American Life") and Delaware American Life Insurance ("DelAm") [Member] | Equity Units
     
Fair Value of Purchase Price      
Value of securities issued for business acquisition     $ 3,000