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SHARE-BASED COMPENSATION (DETAILS) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]        
Share based compensation expense incurred $ 11 $ 18 $ 41 $ 54
Tax benefit related to share-based compensation costs incurred 3 4 11 10
Fair value - vested during period     73 66
Unrecognized share-based compensation costs $ 107   $ 107  
Unrecognized share-based compensation costs - weighted average period expected to be recognized     2 years 3 months 29 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)     (1,131,000)  
Forfeited (number)     (249,000)  
Nonvested restricted stock (number) - end of period 1,944,000   1,944,000  
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     36.35  
Weighted average grant date fair value - forfeited     43.07  
Weighted average grant date fair value - end of period $ 43.21   $ 43.21  
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 $ 23 $ 14 $ 23 $ 14