Share-Based Compensation - Schedule of Stock Options Activity (Details) - Stock options [member] - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance		1,076,031
Effect of the spin-offs		251,145
Granted		748,965		503,150	309,528
Exercised		(61,888)
Forfeited or expired		(20,799)
Outstanding, ending balance		1,993,454	[1]	1,076,031
Exercisable	[1]	741,798
Weighted average exercise price, beginning balance		$ 66.83
Weighted average exercise price, effect of the spin-offs	[2]	57.60
Weighted average exercise price, granted		58.40		$ 58.83	$ 82.38
Weighted average exercise price, exercised	[2]	46.75
Weighted average exercise price, forfeited, canceled or expired	[2]	53.47
Weighted average exercise price, ending balance		51.24		$ 66.83
Weighted average exercise price, exercisable	[2]	$ 48.32
Aggregate intrinsic value of outstanding stock options		$ 57
Aggregate intrinsic value of exercisable stock options		$ 23

[1] The aggregate intrinsic value of options outstanding and options exercisable was $57 million and $23 million, respectively, as of December 31, 2017.

[2] The weighted average exercise price was adjusted to reflect the Conversion Factor.