SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Reconciliation of cash, cash equivalents, and restricted cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets ("balance sheets") that sum to the total of the same such amounts shown within the Consolidated Statements of Cash Flows ("cash flows statement").

Reconciliation of cash, cash equivalents and restricted cash
	December 31,
(in millions)	2023		2022		2021
Current assets:
Cash and cash equivalents	$	2,741	$	3,266	$	7,933
Restricted cash included in prepaid expenses and other	199		138		163
Noncurrent assets:
Restricted cash included in other noncurrent assets	455		69		473
Total cash, cash equivalents and restricted cash	$	3,395	$	3,473	$	8,569

Summary of property and equipment by classification

The following table summarizes our property and equipment:

Property and equipment by classification
		December 31,
(in millions, except for estimated useful life)	Estimated Useful Life	2023		2022
Flight equipment(1)	25-34 years	$	40,976	$	38,091
Ground property and equipment	3-40 years	9,986		8,996
Information technology-related assets	3-15 years	3,307		3,375
Flight and ground equipment under finance leases	Shorter of lease term or estimated useful life	1,862		1,950
Advance payments for equipment		1,062		1,067
Less: accumulated depreciation and amortization(2)		(21,707)		(20,370)
Total property and equipment, net		$	35,486	$	33,109

(1)Includes aircraft and associated engines and parts.

(2)Includes accumulated amortization for flight and ground equipment under finance leases in the amount of $525 million and $463 million at December 31, 2023 and 2022, respectively.