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Debt - Components of Debt (Parenthetical) (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Capital Leases and Other [Member] |  |
Debt Instrument [Line Items] |  |
End period of maturity for debt instrument | Dec. 31, 2055 |
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 4.60% | 4.70%
End period of maturity for debt instrument | Mar. 01, 2045 |
Tax-exempt Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 1.80% | 1.90%
End period of maturity for debt instrument | Aug. 01, 2045 |
Minimum [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.40% |
Minimum [Member] | Tax-exempt Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 0.70% |
Maximum [Member] | Capital Leases and Other [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 12.00% |
Maximum [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 7.75% |
Maximum [Member] | Tax-exempt Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.70% |
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Credit Facility, aggregate capacity | $ 2,250,000,000 |
Weighted average interest rate | 1.90% |
Maturity date of credit facility | Jul. 30, 2020 |
Other Letter of Credit Facilities [Member] |  |
Debt Instrument [Line Items] |  |
Maturity date of credit facility | Dec. 31, 2018 |
Canadian Term Loan and Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 2.10% | 2.20%
Maturity date of credit facility | Mar. 31, 2019 |

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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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- Definition 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. + References No definition available. + Details
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- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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