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Commitments and Contingencies - Airport Projects (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Assets constructed for others	$ 341	$ 309
LAX Terminal 1.5
Other Commitments [Line Items]
Construction Obligation	364
LAX Terminal 1.5
Other Commitments [Line Items]
Total Not to Exceed Cost Of Airport Project	464
LFMP Terminal
Other Commitments [Line Items]
Municipal bonds principal remaining	399
Net present value of principal remaining	$ 438

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- Definition

The aggregate costs related to airport construction projects recorded as an asset.

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Total Not to Exceed Cost Of Airport Project

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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