Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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Debt - Components of Long-Term Debt - Guarantees (Detail) - USD ($)	Dec. 31, 2015	Aug. 31, 2015	Jun. 30, 2015	Dec. 31, 2013
Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate percentage				10.50%
Secured Debt [Member] \| Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 1,100,000,000
Stated interest rate percentage		2.00%	8.50%
Secured Debt [Member] \| Senior Notes, 5.50, Due in 2019 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 750,000,000
Stated interest rate percentage	5.50%
Secured Debt [Member] \| Senior Notes, 6.125, Due in 2018 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 500,000,000
Stated interest rate percentage	6.125%
Secured Debt [Member] \| Senior Notes, 4.625, Due in 2020 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 500,000,000
Stated interest rate percentage	4.625%
Secured Debt, Tax Exempt [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 8,600,000,000