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Debt - Components of Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 9,310 | $ 8,929
Current portion of long-term debt | 417 | 253
Long-term debt, less current portion | 8,893 | 8,676
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 426 | 20
Canadian Term Loan and Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 239 | 84
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 6,033 | 6,050
Tax-exempt Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 2,304 | 2,447
Capital Leases and Other [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 308 | $ 328

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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 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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