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Capital Management - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) CreditFacility | Dec. 31, 2017
Disclosure of objectives, policies and processes for managing capital [line items] |  |
Number of revolving credit facilities | CreditFacility | 2 |
Net debt to-capitalization ratio | 0.13 | 0.21
Debt-plus-equity ratio | 19.00% | 24.00%
Debt-to-EBITDA ratio | 0.9 | 1.1
Top of range [member] |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |
Targeted Debt to debt-plus-equity ratio | 30.00% |
Targeted Debt-to-EBITDA ratio | 2.5 |
Net debt to-capitalization ratio | 0.55 |
Revolving credit facilities one [member] |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |
Borrowing capacity under revolving credit facilities | $ 4,000 |
Revolving credit facilities two [member] |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |
Borrowing capacity under revolving credit facilities | $ 600 |

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