Income Taxes - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 31, 2024	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Investments [Line Items]
Ordinary loss							$ 4,000
Capital loss							$ 2,400
Income tax benefit			$ (733)	$ (742)	$ (2,656)	$ (2,123)
Capital losses not yet recognized					$ 5,600
Forecast [Member]
Investments [Line Items]
Income tax benefit		$ 900
Subsequent Event [Member]
Investments [Line Items]
Capital loss	$ 900
Capital losses not yet recognized	5,600
Subsequent Event [Member] | IQOS [Member]
Investments [Line Items]
Capital loss	1,700
Subsequent Event [Member] | JUUL [Member]
Investments [Line Items]
Equity securities, FV-NI, ordinary gain (loss), tax basis of investments	6,400
Capital loss	$ 12,800