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Exit and Implementation Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended	24 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025	Sep. 30, 2026
Restructuring Cost and Reserve [Line Items]
Exit costs	$ 3	$ 2	$ 24	$ 3
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs	3	2	24	3
Implementation costs	9	11	82	40
Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	175		175			$ 175
Total						143
Severance costs						46
Payments for restructuring			40		$ 79
Implementation costs						97
Initiative [Member] \| Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs	1	2	3	3
Implementation costs	2	11	16	40
Initiative [Member] \| Operating Segments [Member] \| Oral Tobacco Segment [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs	0	0	0	0
Implementation costs	0	1	2	5
Initiative [Member] \| Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			17		18
Initiative [Member] \| Implementation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			23		$ 61
USSTC Facilities Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	180		180			$ 180
USSTC Facilities Consolidation [Member] \| Operating Segments [Member] \| Oral Tobacco Segment [Member]
Restructuring Cost and Reserve [Line Items]
Exit costs	2	0	21	0
Implementation costs	7	$ 0	66	$ 0
USSTC Facilities Consolidation [Member] \| Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total	9		87
Non-cash asset-related charges	4		63
Severance costs	1		20
Exit costs	$ 4		$ 4