Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Share-Based Compensation Expense (Details)

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SHARE-BASED COMPENSATION - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based compensation expense $ 92 $ 66 $ 51
Tax benefit $ 32 $ 22 $ 18