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Debt - Components of Debt (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt |  |
Debt | $ 10,366 | $ 10,026
Debt issuance costs, discounts and other | (50) | (52)
Current portion of long-term debt | 1,043 | 432
Long-term debt, less current portion | $ 9,323 | 9,594
Revolving Credit Facility [Member] |  |
Debt |  |
Debt |  | 11
Weighted average interest rate | 3.10% |
Commercial Paper Program [Member] |  |
Debt |  |
Debt | $ 1,354 | $ 990
Weighted average interest rate | 2.80% | 2.90%
Senior Notes, Aggregate [Member] |  |
Debt |  |
Debt | $ 6,222 | $ 6,222
Weighted average interest rate | 4.30% | 4.30%
Tax Exempt Bonds [Member] |  |
Debt |  |
Debt | $ 2,354 | $ 2,388
Current portion of long-term debt | $ 72 |
Weighted average interest rate | 2.40% | 2.35%
Financing leases and other debt [Member] |  |
Debt |  |
Debt | $ 486 | $ 467
Current portion of long-term debt | $ 139 |
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] | Financing leases and other debt [Member] |  |
Debt |  |
Interest rate | 9.00% |

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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 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 + 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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