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Significant Accounting Policies - Operating Revenue by Principal Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 10,888	$ 11,380	$ 11,402	$ 9,589	$ 10,491	$ 11,003	$ 10,777	$ 9,032	$ 43,259	$ 41,303	[1]	$ 37,784	[1]
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Revenue									26,960	25,552		23,114
Atlantic
Disaggregation of Revenue [Line Items]
Revenue									7,387	7,103		6,340
Pacific
Disaggregation of Revenue [Line Items]
Revenue									5,132	5,188		4,914
Latin America
Disaggregation of Revenue [Line Items]
Revenue									$ 3,780	$ 3,460		$ 3,416
[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 II, Item 8 of this report for additional information.

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-Name Accounting Standards Codification
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