Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Equity Based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation	$ 9	$ 12	$ 21	$ 20
Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Converted stock					4.3
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Converted stock					2.5
Stock based compensation award, vested			0.4
Restricted Stock Units [Member] \| Settled in Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted		0.1		0.1
Stock based compensation award, vested			0.3
Restricted Stock Units [Member] \| Settled in Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation award, vested			0.1
Stock based compensation award			0.9
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted		4.3	3.1	4.3
Stock based compensation award, vested			2.0
Performance Stock Units [Member] \| Settled in Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted		2.7	2.0	2.7
Stock based compensation award, vested			1.5
Performance Stock Units [Member] \| Settled in Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation award, vested			0.5
Stock based compensation award			$ 8.2
2013 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares authorized	30		30