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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option and Restricted Share Activity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Intrinsic value of outstanding options $ 77
Weighted average remaining contractual life of outstanding options 8 years 8 months 11 days
Time-vesting Options
 
Options, Number of Shares Roll Forward  
Outstanding at January 1, 2013 3.10
Granted 0.01
Exercised (0.06)
Cancelled/Expired (0.02)
Outstanding at June 30, 2013 (a) 3.03 [1]
Options, Weighted Average Exercise Price Roll Forward  
Outstanding at January 1, 2013 $ 26.61
Granted $ 44.30
Exercised $ 18.37
Cancelled/Expired $ 19.24
Outstanding at June 30, 2013 (a) $ 26.86 [1]
Phantom / Other Performance Options
 
Options, Number of Shares Roll Forward  
Outstanding at January 1, 2013 0.16
Granted 0
Exercised 0
Cancelled/Expired 0
Outstanding at June 30, 2013 (a) 0.16 [1]
Options, Weighted Average Exercise Price Roll Forward  
Outstanding at January 1, 2013 $ 20.61
Granted $ 0.00
Exercised $ 0.00
Cancelled/Expired $ 0.00
Outstanding at June 30, 2013 (a) $ 20.61 [1]
Restricted Stock
 
Restricted Stock, Number of Shares Roll Forward  
Outstanding at January 1, 2013 0.29
Granted 0.09
Vested 0
Cancelled/Expired (0.03)
Outstanding at June 30, 2013 (a) 0.35
Restricted Stock, Weighted Average Grant Date Fair Value Roll Forward  
Outstanding at January 1, 2013 $ 27.09
Granted $ 44.00
Vested $ 0.00
Cancelled/Expired $ 27.00
Outstanding at June 30, 2013 (a) $ 31.27
Restricted Stock Units
 
Restricted Stock, Number of Shares Roll Forward  
Outstanding at January 1, 2013 0
Granted 0.04
Vested 0
Cancelled/Expired 0
Outstanding at June 30, 2013 (a) 0.04
Restricted Stock, Weighted Average Grant Date Fair Value Roll Forward  
Outstanding at January 1, 2013 $ 0.00
Granted $ 34.14
Vested $ 0.00
Cancelled/Expired $ 0.00
Outstanding at June 30, 2013 (a) $ 34.14
[1] Options outstanding at June 30, 2013 had an intrinsic value of $77 million and have a weighted average remaining contractual life of 8.7 years.