Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Schedule of Stockholders Equity

The following tables provide changes in shareholders’ equity during the three months ended March 31, 2019 and 2018.

Three Months Ended March 31, 2019	Number of Shares			Amount
(In millions)	Common Shares	Treasury Shares		Common Stock		Additional Paid-In Capital			Accumulated Other Comprehensive Loss			Retained Earnings		Treasury Stock			Total Equity
Balance at December 31, 2018	791	399		$	8	$	1,057		$	(67	)	$	11,635	$	(10,340	)	$	2,293
Net income												225					225
Other comprehensive loss									(18		)						(18		)
Share-based compensation						19											19
Shares issued under stock plans		(2	)			(42		)						37			(5		)
Purchases of treasury stock		2												(120		)	(120		)
Balance at March 31, 2019	791	399		$	8	$	1,034		$	(85	)	$	11,860	$	(10,423	)	$	2,394

Three Months Ended March 31, 2018	Number of Shares			Amount
(In millions)	Common Shares	Treasury Shares		Common Stock		Additional Paid-In Capital			Accumulated Other Comprehensive Loss			Retained Earnings			Treasury Stock			Total Equity
Balance at December 31, 2017	791	376		$	8	$	1,031		$	(54	)	$	10,240		$	(8,494	)	$	2,731
Net income												423						423
Other comprehensive loss									(2		)							(2		)
Share-based compensation						19												19
Shares issued under stock plans		(2	)			(45		)							35			(10		)
Purchases of treasury stock		6													(398		)	(398		)
Cumulative-effect adjustment of ASU 2014-09 adoption												208						208
Cumulative-effect adjustment of ASU 2017-12 adoption									3			(3		)				—
Cumulative-effect adjustment of ASU 2018-02 adoption									(3		)	3						—
Balance at March 31, 2018	791	380		$	8	$	1,005		$	(56	)	$	10,871		$	(8,857	)	$	2,971