Long-Term Debt - 2015 Senior Notes - Additional Information (Detail)	9 Months Ended
Sep. 30, 2015 USD ($)
Debt Instrument [Line Items]
Issuance of senior notes	$ 1,250,000,000
Redemption rate of discount notes	100.00%
Notes properly tendered in cash	40.00%
Change of Control [Member]
Debt Instrument [Line Items]
Notes properly tendered in cash	101.00%
2015 Senior Notes [Member]
Debt Instrument [Line Items]
Issuance of senior notes	$ 1,250,000,000
Interest rate on senior notes	4.625%
Senior secured notes, maturity date	Jan. 15, 2022
Aggregate principal amount of debt issued	$ 0
Repayment of outstanding term loan facility and related premiums, fees and expenses	$ 1,550,000,000
Notes properly tendered in cash	104.625%
Aggregate principal amount of the outstanding 2014 Senior Notes validly tender, percentage	90.00%
2015 Senior Notes [Member] \| Beginning on October 1, 2017 [Member]
Debt Instrument [Line Items]
Notes properly tendered in cash	102.313%
2015 Senior Notes [Member] \| Beginning on October 1, 2018 [Member]
Debt Instrument [Line Items]
Notes properly tendered in cash	101.156%
2015 Senior Notes [Member] \| After October 1, 2019 [Member]
Debt Instrument [Line Items]
Notes properly tendered in cash	100.00%
2015 Senior Notes [Member] \| 2014 Term Loan Facility [Member]
Debt Instrument [Line Items]
Repayment of outstanding term loan facility and related premiums, fees and expenses	$ 1,550,000,000

Aggregate principal amount of outstanding senior note percentage.

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- Definition

The average effective interest rate during the reporting period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Amount of the required periodic payments applied to principal.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

+ References

No definition available.

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- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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