Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule of computations of basic and diluted earnings per share

	Three Months Ended June 30,					Six Months Ended June 30,
	2021		2020			2021		2020
	(in millions, except per share amounts)
Numerator:
Net income	$	591	$	(539)		$	1,028	$	1,497
Denominator:
Basic: Weighted-average common shares outstanding	118.4		125.0			119.1		125.7
Effect of potentially dilutive nonqualified stock options and other share-based awards	2.8		1.2			2.6		1.5
Diluted: Weighted-average common shares outstanding	121.2		126.2			121.7		127.2
Earnings per share:
Basic	$	4.99	$	(4.31)		$	8.63	$	11.91
Diluted	$	4.88	$	(4.31)	(1)	$	8.45	$	11.77

(1) Diluted shares used in this calculation represent basic shares due to the net loss. Using actual diluted shares would result in anti-dilution.