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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [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, 2019		672		$85
Granted		174		84
Exercised		(79)		65				$2
Expired or cancelled		(44)		91
Outstanding, December 31, 2019		723		$87		6.1		$10
Exercisable, December 31, 2019		426		$82		4.5		$8
Outstanding, January 1, 2020		723		$87
Granted		156		93
Exercised		(90)		59				$3
Expired or cancelled		(1)		54
Outstanding, December 31, 2020		788		$91		6.2		$4
Exercisable, December 31, 2020		455		$90		4.5		$3
Outstanding, January 1, 2021		788		$91
Granted		130		92
Exercised		(38)		93				$—
Expired or cancelled		(28)		123
Outstanding, December 31, 2021		852		$90		6.1		$8
Exercisable, December 31, 2021		510		$89		4.8		$6

Schedule of Options Outstanding and Exercisable

Options outstanding and exercisable as of December 31, 2021 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
$75-$80		200		3.3		$76		200		$76
$81-$89		179		6.4		84		103		84
$90-$95		286		8.6		93		39		93
$96-$123		187		5.1		109		168		107
		852		6.1		$90		510		$89

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		2021				2020				2019
Average risk-free interest rate			0.7	%			1.5	%			2.5	%
Expected dividend yield			2.7	%			2.5	%			2.9	%
Expected volatility			35.0	%			27.0	%			27.0	%
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, 2019			396			$	92				1.3
Granted			236				84
Vested			(150	)			76
Forfeited			(36	)			93
Unvested, December 31, 2019			446			$	97				1.5
Granted			200			$	92
Vested			(145	)			95
Forfeited			(17	)			93
Unvested, December 31, 2020			484			$	94				1.4
Granted			208			$	87
Vested			(124	)			106
Forfeited			(23	)			84
Unvested, December 31, 2021			545			$	85				1.3			$	53

Performance Share Units

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

	2018			2019			2020			2021			2021
Grant Date(s)	February 15, 2018			February 15, 2019			February 14, 2020			February 12, 2021			February 12, 2021
Performance Period (years)	2018-2020			2019-2021			2020-2022			2021-2022			2021
Vesting Date(1)	February 2021			February 2022			February 2023			February 2023			February 2024
Payout Levels (in units):
Threshold Award		42,361			61,381			59,698			39,882			61,076
Target Award		84,726			122,761			119,395			79,763			122,152
Outstanding Award		169,452			245,522			238,790			159,526			244,304
Shares Issued in 2021		42,365			—			—			—			—
Payout Achieved Over Performance Period		—			81,700			—			—			—

(1) Awards are scheduled to vest after the People, Culture and Compensation 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 for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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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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