Investments - Narrative (Details)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Jan. 31, 2020
USD ($)
$ / shares
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Dec. 31, 2019
USD ($)
numberOfAircraft
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Dec. 31, 2019
USD ($)
numberOfAircraft
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Dec. 31, 2018
USD ($)
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Dec. 31, 2017
USD ($)
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Sep. 30, 2019 |
| Schedule of Equity Method Investments [Line Items] |
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| Net gain on equity investments |
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$ 119,000,000
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$ 38,000,000
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$ 0
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| GOL |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership stake in equity securities sold during period (percent) |
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9.00%
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| Proceeds from sale of ownership stake in equity securities |
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$ 278,000,000
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| Term loan facility | Financial Guarantee |
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| Schedule of Equity Method Investments [Line Items] |
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| Guarantee borrowings on third party debt |
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$ 300,000,000
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| Guarantee borrowings on third party debt, term (in years) |
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5 years
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| LATAM |
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| Schedule of Equity Method Investments [Line Items] |
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| Planned investment to support establishment of strategic alliance |
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$ 350,000,000
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$ 350,000,000
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| Payments to support establishment of strategic alliance |
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$ 200,000,000
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| LATAM | A350-900 |
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| Schedule of Equity Method Investments [Line Items] |
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| Number of aircraft agreed to acquire | numberOfAircraft |
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4
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4
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| Number of aircraft commitments planned to be assumed | numberOfAircraft |
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10
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10
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| LATAM |
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| Schedule of Equity Method Investments [Line Items] |
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| Planned investment in strategic alliance (percent) |
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20.00%
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| LATAM | Subsequent event |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership interest (percent) |
20.00%
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| Equity investment purchase price per share (usd per share) | $ / shares |
$ 16
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| Payment to acquire equity investment |
$ 1,900,000,000
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| Wheels Up | Subsequent event |
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| Schedule of Equity Method Investments [Line Items] |
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| Ownership interest (percent) |
27.00%
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