Earnings Per Share - Additional Information (Detail) - $ / shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock Awards and Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive securities	6	5	6	5
Common shares equivalents that would have been included in diluted average shares outstanding	1	1	1	1
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive securities	2	2	2	2
Weighted average exercise price of options	$ 26.45	$ 33.77	$ 26.45	$ 33.77