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Debt - Components of Debt (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Commercial paper, short-term borrowings | $ 210 |
Debt and capital lease obligations | 9,042 | $ 9,310
Current portion of long-term debt | 396 | 417
Long-term debt, less current portion | 8,646 | 8,893
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations |  | 426
Canadian Term Loan and Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 205 | 239
Commercial Paper [Member] |  |
Debt Instrument [Line Items] |  |
Commercial paper, short-term borrowings | 210 |
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 6,033 | 6,033
Tax-exempt Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | 2,304 | 2,304
Capital Leases and Other [Member] |  |
Debt Instrument [Line Items] |  |
Debt and capital lease obligations | $ 290 | $ 308

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + 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)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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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