Equity (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Schedule of Stockholders Equity [Table Text Block]

The activity in equity during the six months ended June 30, 2017 and 2016 is as follows (dollars in millions):

	Common Stock			Accumulated Other Comprehensive Loss			Retained Earnings
	Shares	Amount								Total
Balances as of December 31, 2016	88,946,704	$	1,201	$	(7	)	$	1,150		$	2,344
Issuances of shares pursuant to equity-based plans	115,856	1		—			—			1
Stock-based compensation	—	1		—			—			1
Dividends declared	—	—		—			(59		)	(59		)
Net income	—	—		—			105			105
Balances as of June 30, 2017	89,062,560	$	1,203	$	(7	)	$	1,196		$	2,392
Balances as of December 31, 2015	88,792,751	$	1,196	$	(8	)	$	1,070		$	2,258
Issuances of shares pursuant to equity-based plans	128,005	1		—			—			1
Stock-based compensation	—	1		—			—			1
Dividends declared	—	—		—			(55		)	(55		)
Net income	—	—		—			98			98
Balances as of June 30, 2016	88,920,756	$	1,198	$	(8	)	$	1,113		$	2,303