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Debt - Components of Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt
Debt and capital lease obligations	$ 10,026	$ 9,491
Debt issuance costs, discounts and other	(52)	(56)
Current portion of long-term debt	432	739
Long-term debt, less current portion	9,594	8,752
Revolving Credit Facility [Member]
Debt
Debt and capital lease obligations	$ 11
Weighted average interest rate	3.10%
Commercial Paper Program [Member]
Debt
Debt and capital lease obligations	$ 990	$ 515
Weighted average interest rate	2.90%	1.90%
Canadian Term Loan and Revolving Credit Facility [Member]
Debt
Debt and capital lease obligations		$ 113
Weighted average interest rate		2.50%
Senior Notes, Aggregate [Member]
Debt
Debt and capital lease obligations	$ 6,222	$ 6,222
Weighted average interest rate	4.30%	4.30%
Tax Exempt Bonds [Member]
Debt
Debt and capital lease obligations	$ 2,388	$ 2,370
Current portion of long-term debt	$ 106
Weighted average interest rate	2.35%	2.00%
Capital Leases and Other [Member]
Debt
Debt and capital lease obligations	$ 467	$ 327
Current portion of long-term debt	$ 161
Minimum [Member] | Senior Notes, Aggregate [Member]
Debt
Interest rate	2.40%
Minimum [Member] | Tax Exempt Bonds [Member]
Debt
Interest rate	1.35%
Maximum [Member] | Senior Notes, Aggregate [Member]
Debt
Interest rate	7.75%
Maximum [Member] | Tax Exempt Bonds [Member]
Debt
Interest rate	4.30%
Maximum [Member] | Capital Leases and Other [Member]
Debt
Interest rate	12.00%

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ 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 210.5-02.19,20)
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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))
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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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Weighted average interest rate of debt outstanding.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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