Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Fair Value of Each Stock Option Award is Estimated on Grant Date, Using Option Valuation Models

expected share-based award life on the date of grant. The expected life is an estimate of the number of years a share-based award will be held before it is exercised.

	2017			2016			2015
Risk-free interest rate		2.13	%		1.70	%		1.59	%
Expected volatility		31	%		36	%		36	%
Expected life, in years		6.17			6.25			6.25
Expected dividend yield		—			—			—

Schedule of Stock Option Activity

Information regarding Time Stock Options and SARs and Performance Stock Options and SARs activity during 2017, 2016 and 2015 is summarized below (share amounts in thousands):

	Time Stock Options and SARs			Performance Stock Options and SARs			Total Stock Options and SARs			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value (dollars in millions)
Options and SARs outstanding, December 31, 2014		15,051			14,744			29,795		$	21.39
Granted		1,746			—			1,746			69.16
Exercised		(4,093	)		(3,988	)		(8,081	)		12.77
Cancelled		(539	)		(329	)		(868	)		32.59
Options and SARs outstanding, December 31, 2015		12,165			10,427			22,592			27.73
Granted		1,601			—			1,601			69.96
Exercised		(2,521	)		(4,171	)		(6,692	)		15.85
Cancelled		(309	)		(126	)		(435	)		55.17
Options and SARs outstanding, December 31, 2016		10,936			6,130			17,066			35.65
Granted		1,879			—			1,879			81.83
Exercised		(1,549	)		(1,366	)		(2,915	)		21.49
Cancelled		(110	)		(178	)		(288	)		52.92
Options and SARs outstanding, December 31, 2017		11,156			4,586			15,742			43.47		5.4 years	$	699
Options and SARs exercisable, December 31, 2017		7,060			4,224			11,284		$	32.49		4.4 years	$	625

Schedule of Restricted Stock Units Activity

Information regarding Time RSUs, Performance RSUs and PSUs activity during 2017, 2016 and 2015 is summarized below (share amounts in thousands):

	Time RSUs			Performance RSUs			PSUs			Total RSUs and PSUs			Weighted Average Grant Date Fair Value
RSUs and PSUs outstanding, December 31, 2014		5,895			2,781			—			8,676		$	39.89
Granted		1,694			—			1,411			3,105			69.43
Vested		(1,953	)		(928	)		—			(2,881	)		37.61
Cancelled		(334	)		(113	)		(40	)		(487	)		47.26
RSUs and PSUs outstanding, December 31, 2015		5,302			1,740			1,371			8,413			51.15
Granted		1,450			—			1,178			2,628			69.95
Vested		(2,242	)		(870	)		—			(3,112	)		41.71
Cancelled		(399	)		(80	)		(163	)		(642	)		59.66
RSUs and PSUs outstanding, December 31, 2016		4,111			790			2,386			7,287			61.21
Granted		1,484			—			1,304			2,788			81.90
Vested		(1,824	)		(430	)		—			(2,254	)		51.20
Cancelled		(306	)		(133	)		(128	)		(567	)		64.06
RSUs and PSUs outstanding, December 31, 2017		3,465			227			3,562			7,254			72.05