Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Earnings Per Share Table

The following provides a reconciliation between basic and diluted EPS attributable to common stockholders:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
millions except per-share amounts	2018		2017			2018			2017
Net income (loss)
Net income (loss) attributable to common stockholders	$	363	$	(699	)	$	513		$	(1,432	)
Income (loss) effect of TEUs	—		(2		)	(4		)	(6		)
Less distributions on participating securities	2		—			4			—
Less undistributed income allocated to participating securities	2		—			1			—
Basic	$	359	$	(701	)	$	504		$	(1,438	)
Income (loss) effect of TEUs	—		—			—			(1		)
Diluted	$	359	$	(701	)	$	504		$	(1,439	)
Shares
Average number of common shares outstanding—basic	499		553			507			552
Dilutive effect of stock options	1		—			1			—
Average number of common shares outstanding—diluted	500		553			508			552
Excluded due to anti-dilutive effect	8		11			9			11
Net income (loss) per common share
Basic	$	0.72	$	(1.27	)	$	0.99		$	(2.60	)
Diluted	$	0.72	$	(1.27	)	$	0.99		$	(2.61	)

Schedule of Accelerated Share Repurchases

During the nine months ended September 30, 2018, the Company entered into and completed two ASR Agreements and open-market repurchases as presented below:

millions except per-share amounts
Agreement Date	Settlement Date	Amount		Average Price per Share		Initial Shares Delivered	Additional Shares Delivered	Total Shares Delivered
ASR Agreements
January 2018	February 2018	$	500	$	58.82	7.0	1.5	8.5
March 2018	June 2018	1,441		65.28		19.1	3.0	22.1
Total ASR Agreements		1,941				26.1	4.5	30.6
Open-market repurchases
August 2018	August 2018	250		66.14		N/A	N/A	3.8
September 2018	September 2018	250		63.11		N/A	N/A	3.9
Total open-market repurchases		500						7.7
Total		$	2,441					38.3