Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes and amounts in AOCI for pension and other postretirement benefit plans (Details)

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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes and amounts in AOCI for pension and other postretirement benefit plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension plans    
Net periodic pension and other postretirement benefit cost    
Prior Service Credit (Cost) $ (17) $ (17)
Net actuarial gain (loss) (1,889) (1,738)
Changes in AOCI for our benefit plans, pretax    
Beginning balance in AOCI (1,755) (2,125)
Recognized prior service cost (credit) 1 0
Recognized net actuarial loss (gain) 177 107
Prior service cost arising during the year 0 (9)
Net actuarial gain (loss) occurring during the year (313) 232
Net foreign currency translation adjustments (16) 40
Balance in AOCI (1,906) (1,755)
Other postretirement benefit plans    
Net periodic pension and other postretirement benefit cost    
Prior Service Credit (Cost) 20 24
Net actuarial gain (loss) 41 71
Changes in AOCI for our benefit plans, pretax    
Beginning balance in AOCI 95 (4)
Recognized prior service cost (credit) (3) (3)
Recognized net actuarial loss (gain) (19) 0
Prior service cost arising during the year (1) 0
Net actuarial gain (loss) occurring during the year (12) 104
Net foreign currency translation adjustments 1 (2)
Balance in AOCI $ 61 $ 95