ACCUMULATED OTHER COMPREHENSIVE LOSS

12 Months Ended

Dec. 31, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

ACCUMULATED OTHER COMPREHENSIVE LOSS

ACCUMULATED OTHER COMPREHENSIVE LOSS

Components of accumulated other comprehensive loss
(in millions)	Pension and Other Benefits Liabilities(2)		Other		Tax Effect		Total
Balance at January 1, 2021	$	(10,843)	$	41	$	1,764	$	(9,038)
Changes in value	2,077		—		(484)		1,593
Reclassifications into earnings(1)	411		—		(96)		315
Balance at December 31, 2021	(8,355)		41		1,184		(7,130)
Changes in value	1,419		—		(330)		1,089
Reclassifications into earnings(1)	312		—		(72)		240
Balance at December 31, 2022	(6,624)		41		782		(5,801)
Changes in value	(303)		(1)		71		(233)
Reclassifications into earnings(1)	246		—		(57)		189
Balance at December 31, 2023	$	(6,681)	$	40	$	796	$	(5,845)

(1)Amounts reclassified from AOCI for pension and other benefits liabilities are recorded in pension and related (expense)/benefit in non-operating expense in the income statement.

(2)Includes approximately $755 million of deferred income tax expense as a result of tax law changes and prior valuation allowance releases through continuing operations, that will not be recognized in net income until pension and other benefit obligations are fully extinguished.