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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based 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, 2015	2,484			$59
Granted	147		77
Exercised	(1,255	)	56					$39
Expired or cancelled	(104	)	56
Outstanding, December 31, 2015	1,272			$64		5.2		$26
Vested or expected to vest, December 31, 2015	1,267			$64		5.2
Exercisable, December 31, 2015	911			$62		4.0		$20
Outstanding, January 1, 2016	1,272			$64
Granted	166		75
Exercised	(279	)	63					$5
Expired or cancelled	(32	)	67
Outstanding, December 31, 2016	1,127			$66		4.9		$26
Vested or expected to vest, December 31, 2016	1,122			$66		4.9
Exercisable, December 31, 2016	756			$62		3.3		$20
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

Schedule of options outstanding and exercisable

Options outstanding and exercisable as of December 31, 2017 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
$27-$49	35		2.8		$39			35			$39
$50-$59	59		3.8	53				59		53
$60-$75	163		7.8	75				39		73
$76-$97	317		7.8	87				87		78
	574		7.1		$77			220			$65

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	2017		2016		2015
Average risk-free interest rate	2.0	%	1.4	%	1.6	%
Expected dividend yield	2.0	%	2.1	%	1.5	%
Expected volatility	31.0	%	33.0	%	32.0	%
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, 2015	463			$57		1.2
Granted	179		76
Vested	(217	)	59
Forfeited	(20	)	60
Unvested, December 31, 2015	405			$64		1.3
Granted	232			$75
Vested	(172	)	62
Forfeited	(14	)	76
Unvested, December 31, 2016	451			$70		1.4
Granted	167			$98
Vested	(133	)	79
Forfeited	(37	)	80
Unvested, December 31, 2017	448			$77		1.2		$56

Summary of performance share units detail by grant year

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

	2014		2015		2016		2017
Grant Date(s)	February 11, 2014 and May 1, 2014		February 11, 2015		February 16, 2016		February 9, 2017
Performance Period (years)									2014-2016		2015-2017		2016-2018		2017-2019
Vesting Date									February 2017		February 2018(a)		February 2019(a)		February 2020(a)
Payout Levels (in units):
Threshold Award	94,608		82,298		65,141		57,563
Target Award	189,215		164,595		130,282		115,125
Outstanding Award	378,430		329,190		260,564		230,250
Shares Issued in 2017	335,179		—		—		—
Payout Achieved Over Performance Period	—		219,519		—		—

(a) 2015, 2016 and 2017 awards are scheduled to vest in February 2018, 2019, and 2020, 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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