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SHARE-BASED COMPENSATION - Share and cash settled awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Performance Based Restricted Stock and Restricted Stock Units | Share Settled    
Number of Restricted Stock    
Nonvested restricted stock - beginning of year (in shares) 283,000 201,000
Granted (in shares) 87,000 104,000
Performance Adjustment (in shares)   26,000
Vested (in shares) (119,000) (48,000)
Forfeited (in shares) (21,000) 0
Nonvested restricted stock - end of year (in shares) 230,000 283,000
Weighted Average Grant Date Fair Value    
Weighted average grant date fair value - beginning of year (in usd per share) $ 51.27 $ 49.24
Weighted average grant date fair value - granted (in usd per share) 64.58 53.80
Weighted average grant date fair value - performance adjusted (in usd per share)   45.95
Weighted average grant date fair value - vested (in usd per share) 49.14 45.38
Weighted average grant date fair value - forfeited (in usd per share) 55.00 0.00
Weighted average grant date fair value - end of year (in usd per share) $ 57.08 $ 51.27
Performance Based Restricted Stock and Restricted Stock Units | Cash Settled    
Number of Restricted Stock    
Nonvested restricted stock - beginning of year (in shares) 68,000 70,000
Granted (in shares) 15,000 18,000
Performance Adjustment (in shares)   12,000
Vested (in shares) (38,000) (32,000)
Forfeited (in shares) (3,000) 0
Nonvested restricted stock - end of year (in shares) 42,000 68,000
Service Based Restricted Stock And Restricted Stock Units | Share Settled    
Number of Restricted Stock    
Nonvested restricted stock - beginning of year (in shares) 1,593,000 1,954,000
Granted (in shares) 733,000 589,000
Vested (in shares) (889,000) (789,000)
Forfeited (in shares) (82,000) (161,000)
Nonvested restricted stock - end of year (in shares) 1,355,000 1,593,000
Weighted Average Grant Date Fair Value    
Weighted average grant date fair value - beginning of year (in usd per share) $ 48.88 $ 43.34
Weighted average grant date fair value - granted (in usd per share) 61.94 53.87
Weighted average grant date fair value - vested (in usd per share) 47.48 39.29
Weighted average grant date fair value - forfeited (in usd per share) 54.89 47.33
Weighted average grant date fair value - end of year (in usd per share) $ 57.09 $ 48.88
Service Based Restricted Stock And Restricted Stock Units | Cash Settled    
Number of Restricted Stock    
Nonvested restricted stock - beginning of year (in shares) 1,392,000 1,433,000
Granted (in shares) 432,000 497,000
Vested (in shares) (763,000) (377,000)
Forfeited (in shares) (73,000) (161,000)
Nonvested restricted stock - end of year (in shares) 988,000 1,392,000
Restricted Stock Units (RSUs)    
Weighted Average Grant Date Fair Value    
Tax benefit related to share-based compensation costs incurred $ 7  
2014 Long Term Equity Compensation Plan | Cliff Vesting | Service Based Restricted Stock And Restricted Stock Units | Share Settled    
Number of Restricted Stock    
Vested (in shares) (313,391)  
Weighted Average Grant Date Fair Value    
Vesting period 3 years  
2014 Long Term Equity Compensation Plan | Cliff Vesting | Service Based Restricted Stock And Restricted Stock Units | Cash Settled    
Number of Restricted Stock    
Vested (in shares) (307,556)  
Weighted Average Grant Date Fair Value    
Vesting period 3 years