Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Other postretirement benefit plan assets (Details)

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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Other postretirement benefit plan assets (Details) - Other postretirement benefit plans - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets $ 176 $ 373 $ 419
Cash and cash equivalents      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 10 43  
Equity Securities, US based companies      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 73 133  
Equity Securities, International based companies      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 4 4  
Government bonds      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 14 12  
Corporate bonds and debt securities      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 7 71  
Mutual, pooled and commingled funds      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 39 86  
Hedge funds/limited partnerships      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 18 14  
Real estate      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets 6 6  
Other      
Defined Benefit Plan Disclosure      
Defined Benefit Plan, Plan Assets $ 5 $ 4