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v3.20.1

Debt and Interest Rate Derivatives - Borrowings and Repayments (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Debt |  |  |
Debt repayments |  | $ 25 | $ 56
Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Debt instrument face amount | $ 4,000 |  |
Senior Notes, Mandatory Redemption Feature [Member] |  |  |
Debt |  |  |
Debt instrument face amount | $ 3,000 |  |
Redemption price percentage | 101.00% |  |
Canadian Senior Notes [Member] |  |  |
Debt |  |  |
Foreign currency transaction gain (loss) |  | (30) |
Financing leases and other [Member] |  |  |
Debt |  |  |
Debt repayments |  | 25 |
Non-cash financing lease incurred |  | $ 5 |

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