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Debt (Long-Term Debt) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Accrued interest $ 506 $ 394
Debt issuance costs (34) (19)
Total $ 1,986 1,889
Long-term debt, interest rate 14.00%  
6.400% Senior Notes Due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 266 266
Long-term debt, interest rate 6.40%  
Long-term debt, maturity year 2022  
Initial Callable date Aug. 15, 2006  
7.000% Debentures Due 2025 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 46 46
Long-term debt, interest rate 7.00%  
Long-term debt, maturity year 2025  
7.150% Debentures Due 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 100 100
Long-term debt, interest rate 7.15%  
Long-term debt, maturity year 2027  
6.625% Debentures Due 2028 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 141 141
Long-term debt, interest rate 6.625%  
Long-term debt, maturity year 2028  
5.700% Senior Notes Due 2034 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 21 21
Long-term debt, interest rate 5.70%  
Long-term debt, maturity year 2034  
Surplus Notes Due 2033 [Member]    
Debt Instrument [Line Items]    
Surplus notes outstanding [3] $ 940 $ 940
Long-term debt, maturity year 2033  
Callable date for fifth anniversary of initial callable date Jan. 15, 2018  
[1]
Callable on or after August 15, 2006 at 100.00.
[2]
Callable anytime at the greater of 100.00 or the present value of the remaining scheduled payments of principal and interest.
[3]
Contractual interest rate is based on three month LIBOR plus 11.26%. Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.