Leases - Narrative (Details)
$ in Millions |
12 Months Ended |
|
|
|
Dec. 31, 2019
USD ($)
lease
numberOfAircraft
airport
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2018 |
Jan. 01, 2018
USD ($)
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Remaining term of finance leases |
5 years
|
|
7 years
|
|
| Remaining term of operating leases |
12 years
|
|
12 years
|
|
| Operating lease expense | $ |
|
$ 1,600
|
|
|
| Leases that have not yet commenced | $ |
$ 888
|
|
|
|
| New lease standard |
|
|
|
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Transition adjustment to reduce equity upon adoption | $ |
|
|
|
$ 284
|
| Minimum |
|
|
|
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Leases that have not yet commenced, term of contract |
5 years
|
|
|
|
| Maximum |
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|
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|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Leases that have not yet commenced, term of contract |
12 years
|
|
|
|
| Aircraft |
|
|
|
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Number of leases | lease |
343
|
|
|
|
| Number of finance leases | lease |
130
|
|
|
|
| Number of operating leases | lease |
213
|
|
|
|
| Lease component of purchase agreements, number of aircraft | numberOfAircraft |
162
|
|
|
|
| Aircraft | Minimum |
|
|
|
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Remaining term of finance leases |
1 month
|
|
|
|
| Remaining term of operating leases |
1 month
|
|
|
|
| Aircraft | Maximum |
|
|
|
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Remaining term of finance leases |
12 years
|
|
|
|
| Remaining term of operating leases |
12 years
|
|
|
|
| Airport Facilities |
|
|
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| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Number of airports with facility space under lease | airport |
300
|
|
|
|
| Airport Facilities | Minimum |
|
|
|
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| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Remaining term of operating leases |
1 month
|
|
|
|
| Airport Facilities | Maximum |
|
|
|
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Remaining term of operating leases |
31 years
|
|
|
|
| Other Ground Property and Equipment | Minimum |
|
|
|
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| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Remaining term of finance leases |
1 month
|
|
|
|
| Remaining term of operating leases |
1 month
|
|
|
|
| Other Ground Property and Equipment | Maximum |
|
|
|
|
| Lessee, Lease, Description [Line Items] |
|
|
|
|
| Remaining term of finance leases |
7 years
|
|
|
|
| Remaining term of operating leases |
7 years
|
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|