Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement, Noncash Expense [Abstract]

Compensation Expense And Related Tax Benefit For All Share-Based Awards

(In millions)	2019		2018		2017
Compensation expense	$	27	$	26	$	25
Reduction of income tax expense	11		14		19

Summary Of Stock Option Activity

	Number of shares	Weighted average exercise price
Balance at December 31, 2016	3,437,910	$	26.44
Granted	195,882	44.18
Exercised	(941,761)	26.03
Expired	(58,257)	66.20
Forfeited	(73,203)	25.63
Balance at December 31, 2017	2,560,571	27.06
Granted	194,001	55.13
Exercised	(729,346)	26.79
Expired	(2,000)	25.74
Forfeited	(18,628)	31.11
Balance at December 31, 2018	2,004,598	29.85
Granted	256,818	50.80
Exercised	(569,808)	24.61
Expired	(4,330)	22.37
Forfeited	(10,500)	43.13
Balance at December 31, 2019	1,676,778	34.77
Outstanding stock options exercisable as of:
December 31, 2019	1,239,821	$	28.95
December 31, 2018	1,448,244	26.68
December 31, 2017	1,648,367	26.55