v2.4.0.6
Long-Term Incentive Compensation Plans (Stock Options) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Number of Options    
Options outstanding at beginning of period 57  
Canceled (15)  
Options outstanding at end of period 42 [1]  
Options exercisable at end of period 39  
Weighted Average Exercise Price (Per Share)    
Options outstanding at beginning of period $ 48.15  
Canceled $ 47.49  
Options outstanding at end of period $ 48.37 [1]  
Options exercisable at end of period $ 49.93  
Stock Options
   
Fair Value Assumptions    
Risk-free interest rate   2.10%
Expected life   5 years
Expected stock price volatility   32.70%
Expected dividend yield   1.50%
Award vesting period 3 years  
Weighted average fair value of options granted (per share)   $ 8.24
Weighted Average Exercise Price (Per Share)    
Options vested 42  
Options, weighted average exercise price $ 48.58  
Stock Options | Minimum
   
Fair Value Assumptions    
Award expiration period 7 years  
Stock Options | Maximum
   
Fair Value Assumptions    
Award expiration period 10 years  
Stock Options | $28.00 - $39.99
   
Number of Options    
Options outstanding at end of period 12  
Options exercisable at end of period 9  
Weighted Average Exercise Price (Per Share)    
Options outstanding at end of period $ 34.50  
Options exercisable at end of period $ 36.15  
Exercise Price Range    
Options outstanding, average remaining life 1 year 5 months  
Options exercisable, average remaining life 1 month  
Stock Options | $40.00 - $49.99
   
Number of Options    
Options outstanding at end of period 18  
Options exercisable at end of period 18  
Weighted Average Exercise Price (Per Share)    
Options outstanding at end of period $ 46.57  
Options exercisable at end of period $ 46.57  
Exercise Price Range    
Options outstanding, average remaining life 1 year 1 month  
Options exercisable, average remaining life 1 year 1 month  
Stock Options | $50.00 - $59.99
   
Number of Options    
Options outstanding at end of period 1  
Options exercisable at end of period 1  
Weighted Average Exercise Price (Per Share)    
Options outstanding at end of period $ 52.05  
Options exercisable at end of period $ 52.05  
Exercise Price Range    
Options outstanding, average remaining life 3 years  
Options exercisable, average remaining life 3 years  
Stock Options | $60.00 - $76.99
   
Number of Options    
Options outstanding at end of period 11  
Options exercisable at end of period 11  
Weighted Average Exercise Price (Per Share)    
Options outstanding at end of period $ 66.75  
Options exercisable at end of period $ 66.75  
Exercise Price Range    
Options outstanding, average remaining life 3 years 11 months  
Options exercisable, average remaining life 3 years 11 months  
[1] At December 31, 2012, approximately 42 million options with a weighted average exercise price of $48.58 were vested.