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Short-Term Debt (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Nov. 30, 2018
Short-term Debt [Line Items] |  |  |
Short-term debt (note 8) | $ 10,000,000 | $ 10,000,000 |
Teekay Tankers |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 29,800,000 | 32,000,000.0 |
Short-term debt (note 8) | $ 10,000,000.0 | $ 10,000,000.0 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 3.60% | 3.60% |
Teekay Tankers | Short-term Debt [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 80,000,000.0 |  | $ 40,000,000.0
Debt Instrument, Term | 6 months |  |
Teekay Tankers | Minimum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Capital | $ 20,000,000.0 |  |
Teekay Tankers | Maximum |  |  |
Short-term Debt [Line Items] |  |  |
Capital | $ 30,000,000.0 |  |
Teekay Tankers | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short Term Debt, Interest Rate, Stated Percentage | 3.50% |  |

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