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Fair values of financial instruments - Carrying Value and Estimated Fair Value of our Financial Instrument (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Related party loans receivable | $ 477 | $ 704
Fair value | Level 2 |  |
Assets |  |
Related party loans receivable | 379 | 395
Liabilities |  |
Related party loans payable | 0 | 239
Fair value | Level 2 | Senior credit facilities |  |
Liabilities |  |
Debt | 1,193 | 5,464
Fair value | Level 2 | Credit facilities contained within variable interest entities |  |
Liabilities |  |
Debt | 0 | 590
Fair value | Level 1 | Secured Debt |  |
Liabilities |  |
Debt | 213 | 404
Fair value | Level 3 |  |
Liabilities |  |
Related party loans payable | 424 | 0
Carrying value | Level 2 |  |
Assets |  |
Related party loans receivable | 379 | 488
Liabilities |  |
Related party loans payable | 0 | 239
Carrying value | Level 2 | Senior credit facilities |  |
Liabilities |  |
Debt | 5,662 | 5,549
Carrying value | Level 2 | Credit facilities contained within variable interest entities |  |
Liabilities |  |
Debt | 0 | 598
Carrying value | Level 1 | Secured Debt |  |
Liabilities |  |
Debt | 515 | 476
Carrying value | Level 3 |  |
Liabilities |  |
Related party loans payable | $ 426 | $ 0

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