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v3.10.0.1

Long-Term Debt (Parenthetical) (Detail) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Apr. 16, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Revolving Facility, Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2022 |  |  |
Credit Facility interest rate | 3.19% |  |  |
6.60% Senior Notes, Due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2018 |  |  |
Interest rate on notes | 6.60% | 6.60% |  |
7% Debentures, Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2025 |  |  |
Interest rate on notes | 7.00% |  |  |
6.25% Senior Notes, Due 2037 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2037 |  |  |
Interest rate on notes | 6.25% |  |  |
4.25% Senior Notes, Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2024 |  |  |
Interest rate on notes | 4.25% |  |  |
4.250% Senior Notes, Due 2047 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2047 |  |  |
Interest rate on notes | 4.25% |  |  |
3.450% Senior Notes, Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2027 |  |  |
Interest rate on notes | 3.45% |  |  |
3.500% Senior Notes, Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2027 |  |  |
Interest rate on notes | 3.50% |  |  |
Floating Rate Notes, Due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2020 |  |  |
Interest rate | 2.98% |  | 2.10% | 1.82%
Floating Rate Notes, Due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity year | 2019 |  |  |
Interest rate | 2.82% |  | 2.13% |
Trade Receivable Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit Facility interest rate | 2.71% |  |  | 1.78%

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