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SHARE-BASED COMPENSATION (DETAILS) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
May. 31, 2012
May. 31, 2009
May. 31, 2007
Feb. 24, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock And Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of restricted stock and cash settled awards vested         $ 75 $ 68 $ 70
Unrecognized compensation costs         $ 95 $ 112  
Weighted average period for recognition of share based compensation         1 year 294 days 2 years 102 days  
Restricted Stock And Restricted Stock Units [Member] | Share Settled [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted         661,398 1,121,066 1,007,425
Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted         487,758 1,018,083  
Service Based Restricted Stock And Restricted Stock Units [Member] | Share Settled [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted         557,000    
Service Based Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted         469,099    
Performance Based Restricted Stock and Restricted Stock Units [Member] | Share Settled [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted         104,000    
Performance Based Restricted Stock and Restricted Stock Units [Member] | Cash Settled [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted         18,659    
2007 Long-term Equity Compensation Plan [Member] | Share Settled [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Additional shares authorized for issuance under plan 6,000,000 4,000,000 5,000,000        
Maximum number of shares to be issued under the plan         15,000,000    
Number of awards available for grant under plan         6,007,637    
Period of time subsequent to a change in control during which plan allows for accelerated vesting of awards for certain terminations         2 years    
2007 Long-term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted       495,195      
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted       1,046,299      
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Cliff Vesting [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
General award vesting period         3 years    
2007 Long-term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Graded Vesting [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
General award vesting period         4 years    
Annual award vesting percentage         25.00%    
2007 Long-term Equity Compensation Plan [Member] | Performance Based Restricted Stock and Restricted Stock Units [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock and restricted stock units granted       121,278      
2003 Long-term Equity Compensation Plan [Member] | Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expiry date from date of grant         10 years