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Debt - Components of Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt |  |
Debt and capital lease obligations | $ 9,491 | $ 9,310
Current portion of long-term debt | 739 | 417
Long-term debt, less current portion | 8,752 | 8,893
Revolving Credit Facility [Member] |  |
Debt |  |
Debt and capital lease obligations |  | 426
Credit Facility, aggregate capacity | 2,250 | $ 2,250
Weighted average interest rate |  | 1.90%
Commercial Paper Program [Member] |  |
Debt |  |
Debt and capital lease obligations | 515 |
Current portion of long-term debt | 515 |
Credit Facility, aggregate capacity | $ 1,500 |
Weighted average interest rate | 1.90% |
Canadian Term Loan and Revolving Credit Facility [Member] |  |
Debt |  |
Debt and capital lease obligations | $ 113 | $ 239
Weighted average interest rate | 2.50% | 2.10%
Senior Notes, Aggregate [Member] |  |
Debt |  |
Debt and capital lease obligations | $ 6,184 | $ 6,033
Weighted average interest rate | 4.30% | 4.60%
Tax Exempt Bonds [Member] |  |
Debt |  |
Debt and capital lease obligations | $ 2,352 | $ 2,304
Current portion of long-term debt | $ 167 |
Weighted average interest rate | 2.00% | 1.80%
Capital Leases and Other [Member] |  |
Debt |  |
Debt and capital lease obligations | $ 327 | $ 308
Minimum [Member] | Senior Notes, Aggregate [Member] |  |
Debt |  |
Interest rate | 2.40% |
Minimum [Member] | Tax Exempt Bonds [Member] |  |
Debt |  |
Interest rate | 1.20% |
Maximum [Member] | Senior Notes, Aggregate [Member] |  |
Debt |  |
Interest rate | 7.75% |
Maximum [Member] | Tax Exempt Bonds [Member] |  |
Debt |  |
Interest rate | 5.70% |
Maximum [Member] | Capital Leases and Other [Member] |  |
Debt |  |
Interest rate | 12.00% |

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- 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 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- 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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