v2.4.0.6
Income Taxes Textuals (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of Income Tax Expense (Benefit) [Line Items]      
Income tax (expense) benefit related to other comprehensive income $ (1,442,000,000) $ 1,139,000,000 $ (1,291,000,000)
Net operating loss related to deferred tax assets 900,000,000    
Credit carry forwards related to deferred tax assets 158,000,000    
Undistributed foreign earnings 1,300,000,000    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 4,300,000,000    
Unrecognized Tax Benefits 6,069,000,000 5,005,000,000 5,500,000,000
Accrued interest and penalties 1,000,000,000 871,000,000  
Recognized Interest and Penalties Expense 92,000,000 32,000,000  
Possible decrease in unrecognized tax benefits 1,500,000,000    
Expiration date of tax credit carryforwards Dec. 31, 2032    
Income tax positions on temporary differences [Member]
      
Components of Income Tax Expense (Benefit) [Line Items]      
Unrecognized Tax Benefits 1,800,000,000    
Income tax liability related to undistributed foreign earnings
      
Components of Income Tax Expense (Benefit) [Line Items]      
Income tax liability related to undistributed foreign earnings $ 367,000,000