v3.24.0.1
Benefit Plans: (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, beginning balance $ 3    
Employer contributions, net of refunds (21) $ 3 $ (269)
Fair value of plan assets, ending balance 3 3  
Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning balance 8,606 10,998  
Service cost 174 233 291
Interest cost 258 78 50
Benefits paid (520) (429)  
Employee contributions 145 141  
Settlement, curtailment and plan amendment (17) (17)  
Actuarial losses (gains) 1,209 (2,294)  
Currency 763 (434)  
Acquisition of Swedish Match 0 316  
Other (51) 14  
Benefit obligation, ending balance 10,567 8,606 10,998
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, beginning balance 7,939 9,337  
Actual return on plan assets 643 (1,061)  
Employer contributions, net of refunds 21 (3)  
Employee contributions 145 141  
Benefits paid (520) (429)  
Settlement (17) (14)  
Currency 639 (333)  
Acquisition of Swedish Match 0 303  
Other 1 (2)  
Fair value of plan assets, ending balance 8,851 7,939 9,337
Net benefit liability (1,716) (667)  
Postretirement      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning balance 229 198  
Service cost 4 2 2
Interest cost 12 6 5
Benefits paid (13) (9)  
Employee contributions 0 0  
Settlement, curtailment and plan amendment 0 0  
Actuarial losses (gains) 24 (46)  
Currency (4) (5)  
Acquisition of Swedish Match 0 85  
Other (6) (2)  
Benefit obligation, ending balance 246 229 198
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, beginning balance 3 0  
Actual return on plan assets 0 0  
Employer contributions, net of refunds 13 9  
Employee contributions 0 0  
Benefits paid (13) (9)  
Settlement 0 0  
Currency 0 0  
Acquisition of Swedish Match 0 3  
Other 0 0  
Fair value of plan assets, ending balance   3 $ 0
Net benefit liability $ (243) $ (226)