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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

A summary of stock option activity is as follows:

		Shares (000)		Wtd. Avg. Exercise Price Per Share		Wtd. Avg. Remaining Contractual Term (years)		Aggregate Intrinsic Value (in millions)
Outstanding, January 1, 2017		1,127		$66
Granted		145		97
Exercised		(680)		64				$24
Expired or cancelled		(18)		75
Outstanding, December 31, 2017		574		$77		7.1		$28
Vested or expected to vest, December 31, 2017		571		$77		7.1
Exercisable, December 31, 2017		220		$65		5.3		$14
Outstanding, January 1, 2018		574		$77
Granted		122		123
Exercised		(24)		78				$1
Expired or cancelled		—		—
Outstanding, December 31, 2018		672		$85		5.9		$1
Vested or expected to vest, December 31, 2018		670		$85		5.9
Exercisable, December 31, 2018		401		$76		4.5		$1
Outstanding, January 1, 2019		672		$85
Granted		174		84
Exercised		(79)		65				$2
Expired or cancelled		(44)		91
Outstanding, December 31, 2019		723		$87		6.1		$10
Vested or expected to vest, December 31, 2019		722		$87		6.1
Exercisable, December 31, 2019		426		$82		4.5		$8

Schedule of Options Outstanding and Exercisable

Options outstanding and exercisable as of December 31, 2019 were as follows:

		Options Outstanding						Options Exercisable
Exercise Price		Shares (000)		Weighted- Average Remaining Contractual Life (years)		Weighted- Average Exercise Price		Shares (000)		Weighted- Average Exercise Price
$44-$59		66		2.1		$51		66		$51
$60-$79		225		5.3		76		196		76
$80-$99		319		7.2		89		115		93
$100-$123		113		6.6		123		49		123
		723		6.1		$87		426		$82

Assumptions Used to Estimate Fair Value of Share Awards

We estimated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model and the following assumptions:

Year Ended December 31		2019				2018				2017
Average risk-free interest rate			2.5	%			2.6	%			2.0	%
Expected dividend yield			2.9	%			1.6	%			2.0	%
Expected volatility			27.0	%			27.0	%			31.0	%
Expected term (years)			6.0				6.0				6.0

Summary of Restricted Stock Activity

A summary of restricted stock activity is as follows:

		Shares (000)		Wtd. Avg. Price Per Share		Wtd. Avg. Remaining Contractual Term (years)		Aggregate Intrinsic Value (in millions)
Unvested, January 1, 2017		451		$70		1.4
Granted		167		98
Vested		(133)		79
Forfeited		(37)		80
Unvested, December 31, 2017		448		$77		1.2
Granted		145		$119
Vested		(174)		77
Forfeited		(23)		89
Unvested, December 31, 2018		396		$92		1.3
Granted		236		$84
Vested		(150)		76
Forfeited		(36)		93
Unvested, December 31, 2019		446		$97		1.5		$43

Performance Share Units

A summary of the performance share units detail by grant year is as follows:

		2016				2017				2018				2019
Grant Date(s)		February 16, 2016				February 9, 2017				February 15, 2018				February 15, 2019
Performance Period (years)		2016-2018				2017-2019				2018-2020				2019-2021
Vesting Date		February 2019				February 2020(a)				February 2021(a)				February 2022(a)
Payout Levels (in units):
Threshold Award			65,141				57,563				47,003				68,132
Target Award			130,282				115,125				94,005				136,264
Outstanding Award			260,564				230,250				188,010				272,528
Shares Issued in 2019			125,070				—				—				—
Payout Achieved Over Performance Period			—				88,377				—				—

(a) 2017, 2018 and 2019 awards are scheduled to vest in February 2020, 2021 and 2022, respectively, when the Executive Compensation and Human Resources Committee of the Board of Directors determines the achievement of the performance criteria.

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Tabular disclosure of threshold, target and outstanding award levels for each outstanding grant of performance share units.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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