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v3.19.1

New Accounting Pronouncements (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle |  |
Aircraft rentals | $ 43 | [1]
[1] | Net of sublease income of $25 million

X
- Definition Expenses incurred related to the lease of aircraft from outside third parties that are used in the entity's business operations. + References No definition available. + Details
Name: | us-gaap_AircraftRental
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration