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Fair Value Measurements - Fair Values of Note Payable and Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of note payable $ 104 $ 104
Total 1,008 1,045
Senior Debentures 6.900 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate 6.90% 6.90%
Debt instrument, year of maturity 2028 2028
Fair value of senior debt 33 31
Senior Debentures 6.920 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate 6.92% 6.92%
Debt instrument, year of maturity 2028 2028
Fair value of senior debt 469 479
Senior Notes 6.125 % Due 2034
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate 6.125% 6.125%
Debt instrument, year of maturity 2034 2034
Fair value of senior debt 402 431
Quoted prices in active markets for identical assets (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of note payable 0 0
Total 0 0
Quoted prices in active markets for identical assets (Level 1) | Senior Debentures 6.900 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 0 0
Quoted prices in active markets for identical assets (Level 1) | Senior Debentures 6.920 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 0 0
Quoted prices in active markets for identical assets (Level 1) | Senior Notes 6.125 % Due 2034
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 0 0
Significant other observable inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of note payable 104 104
Total 1,008 1,045
Significant other observable inputs (Level 2) | Senior Debentures 6.900 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 33 31
Significant other observable inputs (Level 2) | Senior Debentures 6.920 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 469 479
Significant other observable inputs (Level 2) | Senior Notes 6.125 % Due 2034
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 402 431
Significant unobservable inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of note payable 0 0
Total 0 0
Significant unobservable inputs (Level 3) | Senior Debentures 6.900 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 0 0
Significant unobservable inputs (Level 3) | Senior Debentures 6.920 % Due 2028
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt 0 0
Significant unobservable inputs (Level 3) | Senior Notes 6.125 % Due 2034
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of senior debt $ 0 $ 0