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Debt - Components of Debt (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016 | Aug. 31, 2016
--- | --- | --- | ---
Debt |  |  |
Debt and capital lease obligations | $ 9,345 | $ 9,310 |
Current portion of long-term debt | 850 | 417 |
Long-term debt, less current portion | 8,495 | 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 | 502 |  |
Current portion of long-term debt | $ 502 |  |
Credit Facility, aggregate capacity |  |  | $ 1,500
Weighted average interest rate | 1.40% |  |
Canadian Term Loan and Revolving Credit Facility [Member] |  |  |
Debt |  |  |
Debt and capital lease obligations | $ 143 | $ 239 |
Weighted average interest rate | 2.50% | 2.10% |
Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Debt and capital lease obligations | $ 6,033 | $ 6,033 |
Weighted average interest rate | 4.60% | 4.60% |
Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Debt and capital lease obligations | $ 2,339 | $ 2,304 |
Current portion of long-term debt | $ 119 |  |
Weighted average interest rate | 1.90% | 1.80% |
Capital Leases and Other [Member] |  |  |
Debt |  |  |
Debt and capital lease obligations | $ 328 | $ 308 |
Minimum [Member] | Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Interest rate | 2.40% | 2.40% |
Minimum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate | 1.00% | 1.00% |
Maximum [Member] | Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Interest rate | 7.75% | 7.75% |
Maximum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate | 5.70% | 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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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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