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Acquisitions and Dispositions (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Nov. 01, 2010
Dec. 31, 2009
Assets Acquired [Abstract]        
Business Acquisition Purchase Price Allocation Investments     $ 101,036  
Cash and cash equivalents     4,175  
Accrued investment income     948  
Premiums, reinsurance and other receivables     1,971  
Other assets     1,146  
Separate account assets     244  
Total assets     118,730  
Liabilities Assumed [Abstract]        
Future policy benefits     31,811  
Policyholder account benefits     66,652  
Other policy-related balances     7,306  
Deferred and current income tax liability     375  
Other liabilities     2,918  
Separate account liabilities     244  
Total liabilities     109,306  
Redeemable noncontrolling interests in partially owned consolidated subsidiaries 105 117 109  
Noncontrolling interests     (21)  
Goodwill     6,998  
Net assets acquired 233 16,292 16,292 0
Value of Business Acquired [Member]
       
Business Acquisition [Line Items]        
VOBA     $ 9,210