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v3.8.0.1

Short-term and Long-term Debt - Short-term and Long-term Debt (Parenthetical) (Detail) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Feb. 15, 2017
5.50% Unsecured Notes Due 2017 [Member] |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |
Unsecured notes, interest rate | 5.50% | 5.50% |
Unsecured notes, maturity year | 2017 | 2017 |
4.25% Unsecured Notes Due 2018 [Member] |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |
Unsecured notes, interest rate | 4.25% | 4.25% |
Unsecured notes, maturity year | 2018 | 2018 |
6.70% Unsecured Notes Due 2019 [Member] |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |
Unsecured notes, interest rate | 6.70% | 6.70% |
Unsecured notes, maturity year | 2019 | 2019 |
6.125% Unsecured Notes Due 2021 [Member] |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |
Unsecured notes, interest rate | 6.125% | 6.125% |
Unsecured notes, maturity year | 2021 | 2021 |
3.25% Unsecured Notes Due 2027 [Member] |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |
Unsecured notes, interest rate | 3.25% | 3.25% | 3.25%
Unsecured notes, maturity year | 2027 | 2027 |

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- Definition Schedule Of Debt Instruments [Line Items] + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References 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 + Details
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