Share-Based Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2018

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

Weighted Average Black-Scholes Assumptions

Based on the results of the model, the weighted-average grant date fair value of stock options granted for 2018, 2017, and 2016 were $38.34, $44.01 and $31.21, respectively, using the following assumptions:

Weighted Average Black-Scholes Assumptions	2018		2017		2016
Risk-free interest rate	2.6	%	1.9	%	1.2	%
Expected volatility	28.2	%	32.0	%	33.5	%
Expected dividend yield	2.6	%	2.3	%	2.8	%
Expected option life, in years	5		5		5

Summary of Stock Option Activity

The following table summarizes stock option activity during 2018:

In thousands, except per share data	Number of Options		Weighted- Average Exercise Price
Outstanding at January 1	2,265		$	123.27
Granted	481		172.70
Exercised	(367	)	$	46.22
Canceled or expired	(88	)	168.28
Outstanding at December 31	2,291		$	144.21
Exercisable at December 31	1,455		$	131.07

Summary of Additional Information Related to Stock Options Outstanding

The table below summarizes additional information related to stock options outstanding at December 31, 2018:

Options in thousands / dollars in millions, except share data	Outstanding Net of Expected Forfeitures		Options Exercisable
Number of options	2,186		1,455
Weighted-average exercise price per share	$	144.17	$	131.07
Aggregate intrinsic value	$	13	$	14
Weighted-average remaining contractual term, in years	6		5

Summary of Stock Unity Activity

The following table summarizes stock unit activity during 2018:

Stock units in thousands, except per-share data	Number of Stock Units		Weighted- Average Grant Date Fair Value
Non-vested, at January 1	779		$	155.17
Granted	249		157.09
Canceled	(67	)	158.96
Vested and transferred to unrestricted	(233	)	178.91
Non-vested, at December 31	728		$	150.63