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Debt - Components of Debt (Parenthetical) (Detail) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 CAD | Dec. 31, 2016 USD ($)
Domestic Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit Facility, aggregate capacity | $ | $ 2,250 |  | $ 2,250
Weighted average interest rate |  |  | 1.90%
Maturity date of credit facility | Jul. 30, 2020 |  |
Commercial Paper [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 1.40% | 1.40% |
Other Letter of Credit Facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date of credit facility | Dec. 31, 2018 |  |
Foreign Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit Facility, aggregate capacity | CAD |  | CAD 50,000,000 |
Weighted average interest rate | 2.00% | 2.00% | 2.10%
Maturity date of credit facility | Mar. 24, 2019 |  |
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 4.60% | 4.60% | 4.60%
End period of maturity for debt instrument | Mar. 01, 2045 |  |
Senior Notes [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.40% | 2.40% |
Senior Notes [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 7.75% | 7.75% |
Tax-exempt Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 1.90% | 1.90% | 1.80%
End period of maturity for debt instrument | Aug. 01, 2045 |  |
Tax-exempt Bonds [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 0.90% | 0.90% |
Tax-exempt Bonds [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 5.70% | 5.70% |
Capital Leases and Other [Member] |  |  |
Debt Instrument [Line Items] |  |  |
End period of maturity for debt instrument | Dec. 31, 2055 |  |
Capital Leases and Other [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 12.00% | 12.00% |

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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 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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