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SHARE-BASED COMPENSATION (DETAILS) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]        
Share based compensation expense incurred $ 10 $ 19 $ 29 $ 37
Tax benefit related to share-based compensation costs incurred 4 3 8 6
Fair value - vested during period     71 65
Unrecognized share-based compensation costs $ 135   $ 135  
Unrecognized share-based compensation costs - weighted average period expected to be recognized     2 years 6 months 3 days  
Performance Shares [Member]        
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]        
Nonvested restricted stock (number) - beginning of period     347,000  
Granted (number)     104,000  
Vested (number)     0  
Forfeited (number)     (250,000)  
Nonvested restricted stock (number) - end of period 201,000   201,000  
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]        
Weighted average grant date fair value - beginning of period     $ 37.34  
Weighted average grant date fair value - granted     53.32  
Weighted average grant date fair value - vested     0.00  
Weighted average grant date fair value - forfeited     34.42  
Weighted average grant date fair value - end of period $ 49.24   $ 49.24  
Number of restricted stock and restricted stock units granted which will settle in cash     18,659  
Service Based Restricted Stock And Restricted Stock Units [Member]        
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]        
Nonvested restricted stock (number) - beginning of period     2,768,000  
Granted (number)     556,000  
Vested (number)     (1,109,000)  
Forfeited (number)     (29,000)  
Nonvested restricted stock (number) - end of period 2,186,000   2,186,000  
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]        
Weighted average grant date fair value - beginning of period     $ 38.70  
Weighted average grant date fair value - granted     51.69  
Weighted average grant date fair value - vested     36.38  
Weighted average grant date fair value - forfeited     42.29  
Weighted average grant date fair value - end of period $ 43.13   $ 43.13  
Number of restricted stock and restricted stock units granted which will settle in cash     467,849  
Restricted Stock And Restricted Stock Units RSU [Member]        
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]        
Number of restricted stock and restricted stock units granted which will settle in cash     486,508  
Liability for cash-settled units $ 20 $ 9 $ 20 $ 9