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Exit and Implementation Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended	21 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Jun. 30, 2026
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Implementation costs	$ 67	$ 14	$ 73	$ 29
Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	175		175			$ 175
Total						140
Severance costs						45
Implementation costs						95
Payments for restructuring			24		$ 79	114
Initiative [Member] \| Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Implementation costs	8	14	14	29
Initiative [Member] \| Operating Segments [Member] \| Oral Tobacco Segment [Member]
Restructuring Cost and Reserve [Line Items]
Implementation costs	1	2	2	4
Initiative [Member] \| Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	19		19
Payments for restructuring			10		18	28
Initiative [Member] \| Implementation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			14		$ 61	86
USSTC Facilities Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			0
USSTC Facilities Consolidation [Member] \| Operating Segments [Member] \| Oral Tobacco Segment [Member]
Restructuring Cost and Reserve [Line Items]
Implementation costs	59	$ 0	59	$ 0
USSTC Facilities Consolidation [Member] \| Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total	78		78
Facilities Consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 180		$ 180			$ 180