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Risk management and financial instruments - Carrying Value and Estimated Fair Value of our Financial Instrument (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities |  |
Related party loans receivable | $ 198 |
Related party loans receivable, gross | 540 |
Related party loans receivable, allowance for credit losses | 342 |
Fair value | Level 2 |  |
Assets |  |
Related party loans receivable | 391 | $ 379
Fair value | Level 3 | Related party loans payable |  |
Liabilities |  |
Debt | 370 | 424
Fair value | Level 3 | Secured credit facilities |  |
Liabilities |  |
Debt | 1,213 | 1,193
Fair value | Level 1 | Secured debt |  |
Liabilities |  |
Debt | 306 | 213
Carrying value | Level 2 |  |
Assets |  |
Related party loans receivable | 391 | 379
Carrying value | Level 3 | Related party loans payable |  |
Liabilities |  |
Debt | 635 | 426
Carrying value | Level 3 | Secured credit facilities |  |
Liabilities |  |
Debt | 5,662 | 5,662
Carrying value | Level 1 | Secured debt |  |
Liabilities |  |
Debt | $ 546 | $ 515

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