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STOCKHOLDERS' EQUITY (Tables)
3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Schedule of Changes in the Balance of AOCL, Net of Tax
Changes in the balance of AOCL, net of tax, consisted of the following (in millions):
Postretirement
Benefit Plans
Other, netAOCL
Balance at December 31, 2023$(8,704)$(99)$(8,803)
Other comprehensive income (loss) before reclassifications (41)(41)
Amounts reclassified from AOCL
Amortization of net actuarial losses (a)
47  47 
Amortization of net prior service credits (a)
(28) (28)
Other 14 14 
Total reclassified from AOCL19 14 33 
Total other comprehensive income (loss) 19 (27)(8)
Balance at March 31, 2024$(8,685)$(126)$(8,811)
Balance at December 31, 2022$(7,866)$(157)$(8,023)
Other comprehensive income (loss) before reclassifications — (29)(29)
Amounts reclassified from AOCL
Amortization of net actuarial losses (a)
29 — 29 
Amortization of net prior service credits (a)
(66)— (66)
Other— 
Total reclassified from AOCL(37)(34)
Total other comprehensive income (loss)(37)(26)(63)
Balance at March 26, 2023$(7,903)$(183)$(8,086)
(a)Reclassifications from AOCL related to postretirement benefit plans were recorded as a component of FAS income for each period presented. See “Note 6 - Postretirement Benefit Plans”.