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Revenue - Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Operating revenue	$ 11,402	$ 10,777	[1]	$ 20,991	$ 19,809	[1]
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Operating revenue	7,087	6,689		12,962	12,165
Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	2,066	1,965		3,524	3,354
Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	1,306	1,285		2,587	2,516
Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	$ 943	$ 838		$ 1,918	$ 1,774
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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