Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Earnings (Loss) Per Share (Narrative) (Details) - $ / shares shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2014	Jul. 14, 2011
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Antidilutive securities excluded from computation of earnings (loss) per share		6	4	4
Convertible Debt
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Antidilutive securities excluded from computation of earnings (loss) per share		7
Warrants
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Antidilutive securities excluded from computation of earnings (loss) per share		8
Warrants, Conversion price per share					$ 41.14
Convertible Debt
Antidilutive Securities Excluded from Computation of Earnings (Loss) Per Share
Contractual interest rate of 0.75% Convertible Senior Notes due 2016					0.75%
Convertible Senior Notes due description	2016