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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020		Dec. 31, 2019
Supplemental Financial Data [Line Items]
Extended Emergency Time Off	$ 393		$ 0
Voluntary Separation Program 2020	143		0
Profitsharing and savings plans	25		695
Vendor Prepayment	600	[1]	0
Vacation pay	436		434
Health	111		120
Workers compensation	161		166
Property and income taxes	84		79
Interest	49		16
Other	257		239
Accrued liabilities	$ 2,259		$ 1,749
[1] In fourth quarter 2020, the Company received a $600 million prepayment from Chase for Rapid Rewards points expected to be purchased during 2021, based on cardholder activity on its Visa card associated with its loyalty program. The Company currently expects the majority of this amount to be reclassified to deferred revenue in Air Traffic liability--loyalty during the first half of 2021.

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