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Income Taxes (Tax Carryforwards) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Tax Credit Carryforward [Line Items]    
Future Benefits, Insurance and employee benefits $ 2,650 $ 3,033
Future Benefits, Other asset basis differences 1,199 369
Future Benefits, Other liability basis differences 1,543 1,039
Future Benefits, Tax loss carryforwards 528 660
Future Benefits, Tax credit carryforwards 872 963
Future Benefits, Valuation allowances (591) (612)
Deferred Tax Assets, Net of Valuation Allowance 6,201 5,452
Deferred Tax Liabilities Other Asset Basis Difference 5,324 4,584
Deferred Tax Liabilities, Other 531 (124)
Deferred Tax Liabilities, net of valuation allowances 5,855 $ 4,460
Operating Loss Carryforwards 2,901  
Tax Credit Carryforward Amount 871  
Expiration Period Current To Five Years [Member]    
Tax Credit Carryforward [Line Items]    
Operating Loss Carryforwards 274  
Tax Credit Carryforward Amount 3  
Expiration Period Six To Ten Years [Member]    
Tax Credit Carryforward [Line Items]    
Operating Loss Carryforwards 127  
Tax Credit Carryforward Amount 4  
Expiration Period Eleven To Twenty Years [Member]    
Tax Credit Carryforward [Line Items]    
Operating Loss Carryforwards 573  
Tax Credit Carryforward Amount 196  
Expiration Period Indefinite [Member]    
Tax Credit Carryforward [Line Items]    
Operating Loss Carryforwards 1,927  
Tax Credit Carryforward Amount $ 668