Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Schedule of Stock Option Activity (Details)

v3.8.0.1
SHARE-BASED COMPENSATION - Schedule of Stock Option Activity (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Options (in shares):  
Outstanding at beginning of period (in shares) 15
Granted (in shares) 1
Exercised (in shares) (2)
Forfeited'expired (in shares) 0
Outstanding at end of period (in shares) 14
Expected to vest at end of period (in shares) 4
Exercisable at end of period (in shares) 10
Weighted- Average Exercise Price (USD per share):  
Outstanding at beginning of period (USD per share) | $ / shares $ 7.50
Granted (USD per share) | $ / shares 13.09
Exercised (USD per share) | $ / shares 6.72
Forfeited or expired (USD per share) | $ / shares 11.17
Outstanding at end of period (USD per share) | $ / shares 8.21
Vested and expected to vest (USD per share) | $ / shares 11.33
Exercisable (USD per share) | $ / shares $ 7.11
Weighted-Average Remaining Contractual Life (Years)/Aggregate Intrinsic Value  
Outstanding, weighted-average remaining contractual life (years) 3 years 6 months
Expected to vest, weighted-average remaining contractual period (years) 8 years
Exercisable, weighted-average remaining contractual term (years) 1 year 11 months
Outstanding aggregate intrinsic value | $ $ 88
Expected to vest, aggregate intrinsic value | $ 11
Exercisable, aggregate intrinsic value | $ $ 77
Expected to be forfeited (in shares) 0