Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Computation of Earnings Per Share

Earnings per share (in millions, except share data):

	Year Ended December 31,
	2020		2019		2018
Basic:
Net income	$	504	$	544	$	421
Weighted-average shares outstanding	53,441,375		53,991,249		53,591,655
Basic earnings per share	$	9.43	$	10.08	$	7.86
Diluted:
Net income	$	504	$	544	$	421
Weighted-average shares outstanding	53,441,375		53,991,249		53,591,655
Dilutive shares	471,870		603,168		708,157
Diluted weighted-average shares outstanding	53,913,245		54,594,417		54,299,812
Diluted earnings per share	$	9.35	$	9.97	$	7.76