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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Stock-Based Compensation (Tables) [Abstract] 
Pre-tax compensation expense and related income tax benefit for stock-based incentives
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Long-term stock awards
  $ 9     $ 9     $ 28     $ 28  
Stock options
    6       6       17       17  
Phantom stock awards and stock appreciation rights
    (5 )     1       (3 )     —  
 
                       
Total
  $ 10     $ 16     $ 42     $ 45  
 
                       
 
                               
Income tax benefit (before valuation allowance)
  $ 4     $ 6     $ 16     $ 17  
 
                       
Company's long-term stock award activity
                 
    Nine Months Ended
    September 30,
    2011   2010
Unvested stock award shares at January 1
    10       9  
Weighted average grant date fair value
  $ 19     $ 21  
 
               
Stock award shares granted
    2       3  
Weighted average grant date fair value
  $ 13     $ 14  
 
               
Stock award shares vested
    2       2  
Weighted average grant date fair value
  $ 20     $ 23  
 
               
Stock award shares forfeited
    —       —  
Weighted average grant date fair value
  $ 18     $ 19  
 
               
Unvested stock award shares at September 30
    10       10  
Weighted average grant date fair value
  $ 17     $ 19  
Company's stock option activity
                 
    Nine Months Ended
    September 30,
    2011   2010
Option shares outstanding, January 1
    37       36  
Weighted average exercise price
  $ 21     $ 23  
 
               
Option shares granted, including restoration options
    2       5  
Weighted average exercise price
  $ 13     $ 14  
 
               
Option shares exercised
    —       —  
Aggregate intrinsic value on date of exercise (A)
  $1 million   $1 million
Weighted average exercise price
  $ 8     $ 8  
 
               
Option shares forfeited
    3       4  
Weighted average exercise price
  $ 22     $ 23  
 
               
Option shares outstanding, September 30
    36       37  
Weighted average exercise price
  $ 21     $ 21  
Weighted average remaining option term (in years)
    6       6  
 
               
Option shares vested and expected to vest, September 30
    36       37  
Weighted average exercise price
  $ 21     $ 22  
Aggregate intrinsic value (A)
  $—million   $15 million
Weighted average remaining option term (in years)
    6       6  
 
               
Option shares exercisable (vested), September 30
    24       22  
Weighted average exercise price
  $ 24     $ 25  
Aggregate intrinsic value (A)
  $—million   $3 million
Weighted average remaining option term (in years)
    4       4  
    (A) Aggregate intrinsic value is calculated using the Company’s stock price at each respective date, less the exercise price (grant date price) multiplied by the number of shares.
Weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a black-scholes option pricing model
                 
    Nine Months Ended
    September 30,
    2011   2010
Weighted average grant date fair value
  $ 5.10     $ 5.30  
Risk-free interest rate
    2.72 %     2.77 %
Dividend yield
    2.34 %     2.17 %
Volatility factor
    49.00 %     46.01 %
Expected option life
  6 years   6 years