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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Options Granted Under LTIP and TSOP

The Committee granted stock options, RSUs and PSUs pursuant to the LTIP for the last three years as follows:

			2020												2019												2018
			Granted						Weighted- Average Grant-Date Fair Value						Granted						Weighted- Average Grant-Date Fair Value						Granted						Weighted- Average Grant-Date Fair Value
Stock options			43,770						$	52.05					47,360						$	45.74					40,960						$	41.70
RSUs			178,190						210.11						219,710						164.47						217,290						148.37
PSUs			78,830						212.66						102,250						160.97						92,314						147.47

Schedule of Compensation Costs and Tax Benefits

Related compensation costs and tax benefits during the years were:

			2020						2019						2018
			($ in millions)
Stock-based compensation expense			$	28					$	53					$	47
Total tax benefit			44						37						33

Schedule of Assumptions Used for LTIP And TSOP Grants

The assumptions for the LTIP grants for the last three years are shown in the following table:

			2020						2019						2018
Average expected volatility			22		%				23		%				24		%
Average risk-free interest rate			1.47		%				2.56		%				2.55		%
Average expected option term			7.5 years						7.2 years						7.2 years

Schedule of Stock Option Activity

A summary of changes in stock options is presented below:

			Stock Options						Weighted- Average Exercise Price
Outstanding at December 31, 2019			2,677,449						$	91.51
Granted			43,770						213.54
Exercised			(1,171,786)						86.12
Forfeited			(23,308)						156.02
Outstanding at December 31, 2020			1,526,125						98.17

Summary of Stock Options Exercised

The following table provides information related to options exercised for the last three years:

			2020						2019						2018
			($ in millions)
Options exercised			1,171,786						770,597						840,175
Total intrinsic value			$	144					$	86					$	72
Cash received upon exercise			98						53						58
Related tax benefits realized			29						18						16

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity

			2020						2019						2018
			($ in millions)
RSUs vested			204,665						166,197						160,200
Common Stock issued net of tax withholding			146,047						119,346						99,968
Related tax benefit realized			$	4					$	2					$	3

A summary of changes in RSUs is presented below:

			RSUs						Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2019			666,172						$	127.77
Granted			178,190						210.11
Vested			(204,665)						130.87
Forfeited			(39,457)						171.33
Nonvested at December 31, 2020			600,240						148.29

Schedule of Other Share Activity

			2020						2019						2018
			($ in millions)
PSUs earned			235,935						331,099						154,189
Common Stock issued net of tax withholding			156,477						221,241						94,399
Related tax benefit realized			$	7					$	9					$	3

A summary of changes in PSUs is presented below:

			PSUs						Weighted- Average Grant-Date Fair Value
Balance at December 31, 2019			456,510						$	114.04
Granted			78,830						212.66
Earned			(235,935)						89.70
Unearned			(33,705)						58.77
Forfeited			(25,600)						177.41
Balance at December 31, 2020			240,100						171.34

Schedule of Stock Available for Future Grants

Shares of Common Stock available for future grants and issued in connection with all features of the LTIP and the TSOP at December 31, were as follows:

			2020						2019						2018
Available for future grants:
LTIP			8,995,582						9,294,726						8,644,108
TSOP			435,699						434,401						422,973
Issued:
LTIP			1,270,208						852,869						820,746
TSOP			204,102						258,315						213,796

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