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Debt and Credit Facilities - Additional Information (Detail) - 3 months ended Jun. 30, 2015 - USD ($) $ in Millions | Total
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5.50% Senior Notes due September 2025 [Member] |
Debt Instrument [Line Items] |
Credit facility, maturity date | Sep. 15, 2025
Non-lender fees | $ 8
4.50% Senior Notes due September 2023 [Member] |
Debt Instrument [Line Items] |
Credit facility, maturity date | Sep. 15, 2023
Non-lender fees | $ 8
8.375% Senior Notes Due September 2021 [Member] |
Debt Instrument [Line Items] |
Credit facility, maturity date | Sep. 01, 2021
Aggregate repurchase price of senior notes | $ 866
Premium paid on redemption of debt | 99
Accrued interest paid on redemption of debt | 17
Amortization Of Debt Discount Premium | $ 11

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