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SHARE-BASED AND OTHER COMPENSATION PLANS (Details - Share-settled Awards - Outstanding share-settled awards) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incurred/recognized incremental compensation expense $ 48 $ 71
Total unrecognized compensation cost (net of expected forfeitures) and the weighted-average periods over which those costs are expected to be recognized    
Expected Period 3 years  
RSUs | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incurred/recognized incremental compensation expense $ 142  
Total unrecognized compensation cost (net of expected forfeitures) and the weighted-average periods over which those costs are expected to be recognized    
Weighted-Average Period 4 years 3 months  
2014 LTI | PSUs    
Change in number of shares    
Unvested at the beginning of the period (in shares) 823,311  
Granted (in shares) 0  
Vested (in shares) (793,955)  
Forfeited (in shares) (29,356)  
Unvested at the end of the period (in shares) 0 823,311
Change in Weighted Average Grant-Date Fair Value    
Unvested at the beginning of the period (in dollars per share) $ 48.81  
Granted (in dollars per share) 0  
Vested (in dollars per share) 48.81  
Forfeited (in dollars per share) 48.84  
Unvested at the end of the period (in dollars per share) $ 0 $ 48.81
2015 LTI | PSUs    
Change in number of shares    
Unvested at the beginning of the period (in shares) 1,291,788  
Granted (in shares) 0  
Vested (in shares) (266,184)  
Forfeited (in shares) (753,272)  
Unvested at the end of the period (in shares) 272,332 1,291,788
Change in Weighted Average Grant-Date Fair Value    
Unvested at the beginning of the period (in dollars per share) $ 60.02  
Granted (in dollars per share) 0  
Vested (in dollars per share) 57.87  
Forfeited (in dollars per share) 54.46  
Unvested at the end of the period (in dollars per share) $ 60.51 $ 60.02
2016 LTI | PSUs    
Change in number of shares    
Unvested at the beginning of the period (in shares) 1,467,745  
Granted (in shares) 0  
Vested (in shares) (728,576)  
Forfeited (in shares) (98,509)  
Unvested at the end of the period (in shares) 640,660 1,467,745
Change in Weighted Average Grant-Date Fair Value    
Unvested at the beginning of the period (in dollars per share) $ 60.9  
Granted (in dollars per share) 0  
Vested (in dollars per share) 60.28  
Forfeited (in dollars per share) 62.13  
Unvested at the end of the period (in dollars per share) $ 61.55 $ 60.9
2017 LTI | PSUs    
Change in number of shares    
Unvested at the beginning of the period (in shares) 2,173,115  
Granted (in shares) 43,792  
Vested (in shares) (530,388)  
Forfeited (in shares) (106,524)  
Unvested at the end of the period (in shares) 1,579,995 2,173,115
Change in Weighted Average Grant-Date Fair Value    
Unvested at the beginning of the period (in dollars per share) $ 62.78  
Granted (in dollars per share) 58.52  
Vested (in dollars per share) 63.67  
Forfeited (in dollars per share) 63.13  
Unvested at the end of the period (in dollars per share) $ 62.32 $ 62.78
2018 LTI | PSUs    
Change in number of shares    
Unvested at the beginning of the period (in shares) 0  
Granted (in shares) 4,640,722  
Vested (in shares) (1,205,653)  
Forfeited (in shares) (113,041)  
Unvested at the end of the period (in shares) 3,322,028 0
Change in Weighted Average Grant-Date Fair Value    
Unvested at the beginning of the period (in dollars per share) $ 0  
Granted (in dollars per share) 55.47  
Vested (in dollars per share) 55.85  
Forfeited (in dollars per share) 55.92  
Unvested at the end of the period (in dollars per share) $ 55.32 $ 0
Total unrecognized compensation cost (net of expected forfeitures) and the weighted-average periods over which those costs are expected to be recognized    
Unrecognized Compensation Cost $ 215  
Weighted-Average Period 11 months 16 days  
Expected Period 2 years