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Boeing 737 MAX Aircraft Grounding (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) aircraft | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) aircraft | Sep. 30, 2019 USD ($)
Number of Aircraft Grounded Under Emergency Order | 34 |  | 34 |
After-Tax Potential Concessions and Other Considerations Announced July 2019 | $ | $ 4,900 |  | $ 4,900 |
Pre-Tax Potential Concessions and Other Considerations Announced January 2020 | $ | $ 2,600 |  | $ 2,600 |
Number of Aircraft Not Delivered Due to Grounding Under Emergency Order | 41 |  | 41 |
Supplier Proceeds | $ | $ 0 | $ 0 | $ (428) | $ 0
Contract to Own Aircraft |  |  |  |
Number of Aircraft Not Delivered Due to Grounding Under Emergency Order | 28 |  | 28 |
Contract to Lease Aircraft |  |  |  |
Number of Aircraft Not Delivered Due to Grounding Under Emergency Order | 13 |  | 13 |
B-737-Max |  |  |  |
Owned Assets, Number of Units | 31 |  | 31 |

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