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SHARE-BASED COMPENSATION (DETAILS 2) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock And Restricted Stock Units RSU [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Share based compensation expense incurred $ 59 $ 73 $ 57
Tax benefit related to share-based compensation costs incurred $ 15 $ 14 $ 10
Restricted Stock And Restricted Stock Units RSU [Member] | Share Settled [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Granted (number) 661,398 1,121,066 1,007,425
Weighted average grant date fair value - granted $ 51.95 $ 44.46 $ 39.52
Restricted Stock And Restricted Stock Units RSU [Member] | Cash Settled [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Nonvested restricted stock (number) - beginning of year 1,503,380    
Granted (number) 487,758 1,018,083  
Nonvested restricted stock (number) - end of year 1,503,264 1,503,380  
Liability for cash-settled units $ 33 $ 21  
Performance Based Restricted Stock and Restricted Stock Units [Member] | Share Settled [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Nonvested restricted stock (number) - beginning of year 347,000    
Granted (number) 104,000    
Vested (number) 0    
Forfeited (number) (250,000)    
Nonvested restricted stock (number) - end of year 201,000 347,000  
Weighted average grant date fair value - beginning of year $ 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 year $ 49.24 $ 37.34  
Performance Based Restricted Stock and Restricted Stock Units [Member] | Cash Settled [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Granted (number) 18,659    
Service Based Restricted Stock And Restricted Stock Units [Member] | Share Settled [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Nonvested restricted stock (number) - beginning of year 2,768,000    
Granted (number) 557,000    
Vested (number) (1,156,000)    
Forfeited (number) (215,000)    
Nonvested restricted stock (number) - end of year 1,954,000 2,768,000  
Weighted average grant date fair value - beginning of year $ 38.70    
Weighted average grant date fair value - granted 51.70    
Weighted average grant date fair value - vested 36.31    
Weighted average grant date fair value - forfeited 43.02    
Weighted average grant date fair value - end of year $ 43.34 $ 38.70  
Service Based Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member]      
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]      
Granted (number) 469,099