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Schedule II - Condensed Financial Information, Extinguishment of Debt (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 13, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Extinguishment of Debt [Line Items]          
Loss on extinguishment of debt     $ 100 $ 0 $ 0
Loss on extinguishment of debt, after-tax   $ 65 65    
Notes due 2016 2.75% Interest [Member] | Uncollateralized Debt [Member]          
Extinguishment of Debt [Line Items]          
Long-term debt, stated interest rate 2.75%        
Duration of Treasury Rate used in debt redemption discount calculation 10 years        
Basis points added to Treasury rate used in debt redemption discount calculation 0.30%        
Extinguishment of Debt, Amount $ 626        
Loss on extinguishment of debt   21      
Loss on extinguishment of debt, after-tax   14      
Notes due 2019 8.5% Interest [Member] | Uncollateralized Debt [Member]          
Extinguishment of Debt [Line Items]          
Long-term debt, stated interest rate 8.50%        
Duration of Treasury Rate used in debt redemption discount calculation 10 years        
Basis points added to Treasury rate used in debt redemption discount calculation 0.50%        
Extinguishment of Debt, Amount $ 329        
Loss on extinguishment of debt   79      
Parent Company [Member]          
Extinguishment of Debt [Line Items]          
Loss on extinguishment of debt     $ 100 $ 0 $ 0
Parent Company [Member] | Notes due 2016 2.75% Interest [Member] | Uncollateralized Debt [Member]          
Extinguishment of Debt [Line Items]          
Long-term debt, stated interest rate 2.75%        
Duration of Treasury Rate used in debt redemption discount calculation 10 years        
Basis points added to Treasury rate used in debt redemption discount calculation 0.30%        
Extinguishment of Debt, Amount $ 626        
Loss on extinguishment of debt   21      
Loss on extinguishment of debt, after-tax   14      
Parent Company [Member] | Notes due 2019 8.5% Interest [Member] | Uncollateralized Debt [Member]          
Extinguishment of Debt [Line Items]          
Long-term debt, stated interest rate 8.50%        
Duration of Treasury Rate used in debt redemption discount calculation 10 years        
Basis points added to Treasury rate used in debt redemption discount calculation 0.50%        
Extinguishment of Debt, Amount $ 329        
Loss on extinguishment of debt   79      
Loss on extinguishment of debt, after-tax   $ 51