Schedule of Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Stock Issued During Period, Shares, New Issues		10,400,000
Proceeds from Issuance of Common Stock		$ 271
Common Stock, Shares, Outstanding beginning of period	88,792,751
Stockholders' Equity	$ 2,258
Common Stock, Shares, Outstanding end of period	88,899,359
Stockholders' Equity	$ 2,291
Common Stock [Member]
Common Stock, Shares, Outstanding beginning of period	88,792,751	78,344,691	78,228,339
Issuances of shares pursuant to equity-based plans	106,608		116,352
Common Stock, Shares, Outstanding end of period	88,899,359		78,344,691
Common Stock Including Additional Paid in Capital [Member]
Issuance of shares pursuant to equity-based plans	$ 0		$ 1
Adjustments Related to Tax Withholding for Share-based Compensation	(1)		(1)
Stockholders' Equity	1,196	$ 918	918
Dividends declared	0		0
Stockholders' Equity	1,195		918
AOCI Attributable to Parent [Member]
Stockholders' Equity	(8)	(7)	(7)
Stock-based compensation	0		0
Dividends declared	0		0
Stockholders' Equity	(8)		(7)
Retained Earnings [Member]
Stockholders' Equity	1,070	1,028	1,000
Stock-based compensation	0		0
Dividends declared	(27)		(22)
Net Income	61		50
Stockholders' Equity	1,104		1,028
Stockholders' Equity, Total [Member]
Issuance of shares pursuant to equity-based plans	0		1
Adjustments Related to Tax Withholding for Share-based Compensation	(1)		(1)
Stockholders' Equity	2,258	$ 1,939	1,911
Dividends declared	(27)		(22)
Net Income	61		50
Stockholders' Equity	$ 2,291		$ 1,939