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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Passenger travel	$ 625	$ 1,408
Loyalty revenue - air transportation	45	103
Loyalty revenue	45	51
Other revenue	18	26
Total revenue	$ 733	$ 1,588

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- Definition

Other Revenue - Loyalty

+ References

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- Definition

Other Revenue - Non Loyalty

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- Definition

Passenger Revenue - Loyalty Air Travel

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- Definition

Revenue recognized from passenger travel

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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