Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS - Obligations and Funded Status (Details)

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PENSION AND OTHER POSTRETIREMENT BENEFITS - Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amounts recognized in Statements of Financial Position:      
Pension and OPEB, asset $ 356 $ 223  
Amounts recognized in accumulated other comprehensive loss (income):      
Accumulated benefit obligation 4,628 6,013  
Pension Benefits      
Change in benefit obligations:      
Benefit obligations — beginning of year 6,036 6,565  
Service cost 45 56 $ 23
Interest cost 144 103 64
Plan amendments 122 0  
Actuarial gain (1,236) (131)  
Benefits paid (431) (456)  
Participant contributions 0 0  
Effect of settlement (34) (101)  
Other 0 0  
Benefit obligations — end of year 4,646 6,036 6,565
Change in plan assets:      
Fair value of plan assets — beginning of year 5,606 5,332  
Actual return on plan assets (809) 668  
Participant contributions 0 0  
Employer contributions 6 163  
Benefits paid (431) (456)  
Effect of settlement (34) (101)  
Fair value of plan assets — end of year 4,338 5,606 5,332
Funded status (308) (430)  
Amounts recognized in Statements of Financial Position:      
Pension and OPEB, asset 195 153  
Current liabilities (30) (5)  
Non-current liabilities (473) (578)  
Total amount recognized (308) (430)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial gain (361) (286)  
Prior service cost (credit) 121 5  
Net amount recognized (240) (281)  
OPEB      
Change in benefit obligations:      
Benefit obligations — beginning of year 3,254 3,757  
Service cost 35 51 8
Interest cost 72 74 19
Plan amendments (163) 8  
Actuarial gain (1,781) (456)  
Benefits paid (232) (227)  
Participant contributions 47 47  
Effect of settlement 0 0  
Other 1 0  
Benefit obligations — end of year 1,233 3,254 3,757
Change in plan assets:      
Fair value of plan assets — beginning of year 812 783  
Actual return on plan assets (97) 29  
Participant contributions 47 47  
Employer contributions 198 180  
Benefits paid (232) (227)  
Effect of settlement 0 0  
Fair value of plan assets — end of year 728 812 $ 783
Funded status (505) (2,442)  
Amounts recognized in Statements of Financial Position:      
Pension and OPEB, asset 161 71  
Current liabilities (81) (130)  
Non-current liabilities (585) (2,383)  
Total amount recognized (505) (2,442)  
Amounts recognized in accumulated other comprehensive loss (income):      
Net actuarial gain (1,996) (392)  
Prior service cost (credit) (156) 4  
Net amount recognized $ (2,152) $ (388)