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Financial Instruments (Narrative) (Details) $ in Millions	3 Months Ended
Financial Instruments (Narrative) (Details) $ in Millions	Mar. 31, 2025 USD ($) contract	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) contract	Jun. 01, 2023 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Number of foreign currency derivatives held \| contract	0			0
NJOY Holdings, Inc. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration arrangements					$ 500
Change in amount of contingent consideration, liability	$ 25
Contingent consideration, liability	45			$ 20
NJOY Holdings, Inc. [Member] \| Menthol Pod [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration arrangements					250
Payments to acquire businesses, gross		$ 250
NJOY Holdings, Inc. [Member] \| Blueberry Pod [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration arrangements					125
NJOY Holdings, Inc. [Member] \| Watermelon Pod [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration arrangements					$ 125
ABI [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains from net investment hedges	42		$ 42
Foreign currency denominated debt [Member] \| Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax (gains) losses of net investment hedges	$ 139		$ (75)