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Debt and Interest Rate Derivatives - Borrowings and Repayments (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Debt |  |
Debt repayments | $ 705 | $ 385
New borrowings |  | $ 3,971
4.75% senior notes due June 2020 [Member] |  |
Debt |  |
Debt repayments | $ 600 |
Interest rate (as a percent) | 4.75% |
Canadian Senior Notes [Member] |  |
Debt |  |
Interest rate (as a percent) | 2.60% |
Foreign currency transaction gain (loss) | $ (17) |
Tax Exempt Bonds [Member] |  |
Debt |  |
Debt repayments | $ 52 |
Tax Exempt Bonds [Member] | Minimum [Member] |  |
Debt |  |
Interest rate (as a percent) | 0.10% |
Tax Exempt Bonds [Member] | Maximum [Member] |  |
Debt |  |
Interest rate (as a percent) | 4.30% |
Financing leases and other [Member] |  |
Debt |  |
Debt repayments | $ 53 |
Non-cash financing lease incurred | $ 7 |

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- Definition Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32157-110900 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a-c) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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