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Debt - Components of Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt |  |  |
Debt | $ 13,498 |  | $ 10,026
Debt issuance costs, discounts and other | (85) |  | (52)
Current portion of long-term debt | 218 |  | 432
Long-term debt, less current portion | $ 13,280 |  | 9,594
Revolving Credit Facility [Member] |  |  |
Debt |  |  |
Debt |  |  | $ 11
Weighted average interest rate |  |  | 3.10%
Commercial Paper Program [Member] |  |  |
Debt |  |  |
Debt |  |  | $ 990
Weighted average interest rate | 2.90% |  |
Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Debt | $ 9,965 |  | $ 6,222
Weighted average interest rate | 3.90% |  | 4.30%
Canadian Senior Notes [Member] |  |  |
Debt |  |  |
Debt | $ 385 |  |
Interest rate (as a percent) | 2.60% | 2.60% |
Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Debt | $ 2,523 |  | $ 2,388
Current portion of long-term debt | $ 112 |  |
Weighted average interest rate | 2.30% |  | 2.35%
Financing leases and other [Member] |  |  |
Debt |  |  |
Debt | $ 710 |  | $ 467
Current portion of long-term debt | $ 218 |  |
Weighted average interest rate | 4.70% |  |
Minimum [Member] | Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 2.40% |  |
Minimum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 1.35% |  |
Maximum [Member] | Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 7.75% |  |
Maximum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 4.30% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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