Exit and Implementation Costs (Pre-tax Exit and Implementation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Exit costs	$ 2	$ 0	$ 3	$ 354
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs	2		3
Implementation Costs	11		40
Operating Segments [Member] | Smokeable Products Segment [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs	2		3
Implementation Costs	10		35
Operating Segments [Member] | Oral Tobacco Segment [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs	0		0
Implementation Costs	$ 1		$ 5