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Indebtedness: (Narrative) (Details)									12 Months Ended
Indebtedness: (Narrative) (Details)	Feb. 17, 2023 USD ($)	Nov. 21, 2022 USD ($)	Nov. 10, 2022 USD ($)	Nov. 10, 2022 USD ($)	Nov. 07, 2022 USD ($)	Nov. 07, 2022 EUR (€)	Jun. 23, 2022 USD ($)	May 11, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)	Nov. 11, 2022	Jun. 23, 2022 EUR (€)
Debt Instrument [Line Items]
Committed credit facilities, maximum borrowing capacity									$ 6,300,000,000
Borrowings under credit facilities related to Swedish Match AB acquisition									0	$ 13,920,000,000	$ 0
Repayments under credit facilities related to Swedish Match AB acquisition									4,430,000,000	4,000,000,000	$ 0
Term loan									45,941,000,000	37,486,000,000
Borrowings from line of credit									0
Short-term borrowings (Note 8)									1,968,000,000	$ 5,637,000,000
Swedish Match
Debt Instrument [Line Items]
Interest acquired (as a percent)	100.00%									94.81%			94.81%	85.87%
Bank loans
Debt Instrument [Line Items]
Short-term borrowings (Note 8)									283,000,000	$ 295,000,000
Short-Term Credit Arrangement
Debt Instrument [Line Items]
Committed credit facilities, maximum borrowing capacity									2,700,000,000	1,900,000,000
Senior Unsecured Bridge Facility \| Swedish Match
Debt Instrument [Line Items]
Debt term								364 days
Committed credit facilities, maximum borrowing capacity							$ 11,000,000,000	$ 17,000,000,000
Borrowings under credit facilities related to Swedish Match AB acquisition			$ 8,400,000,000	$ 500,000,000	$ 7,900,000,000
Repayments under credit facilities related to Swedish Match AB acquisition	$ 4,400,000,000	$ 4,000,000,000
Senior Unsecured Term Loan \| Swedish Match
Debt Instrument [Line Items]
Committed credit facilities, maximum borrowing capacity							$ 5,800,000,000								€ 5,500,000,000
Borrowings under credit facilities related to Swedish Match AB acquisition \| €						€ 5,500,000,000
Term loan									$ 6,000,000,000	$ 6,000,000,000		€ 5,500,000,000	€ 5,500,000,000
Senior Unsecured Term Loan \| Debt Instrument, Redemption, Period One \| Swedish Match
Debt Instrument [Line Items]
Debt term							3 years
Committed credit facilities, maximum borrowing capacity							$ 3,200,000,000								3,000,000,000
Borrowings under credit facilities related to Swedish Match AB acquisition \| €						3,000,000,000
Senior Unsecured Term Loan \| Debt Instrument, Redemption, Period Two \| Swedish Match
Debt Instrument [Line Items]
Committed credit facilities, maximum borrowing capacity							$ 2,600,000,000								€ 2,500,000,000
Borrowings under credit facilities related to Swedish Match AB acquisition \| €						€ 2,500,000,000