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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

X

- 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

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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

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X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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X

- 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

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X

- 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

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