Asset Impairment, Exit and Implementation Costs (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended			15 Months Ended	24 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs		$ 78	$ 203
Asset impairment and exit costs		33	179	$ 4
Pre-tax implementation costs		45	24
Payments for restructuring		71	73
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs			5
Asset impairment and exit costs		0	5	$ 0
Pre-tax implementation costs			0
Facility Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring related costs	$ 150	$ 150			$ 150	$ 150
Expected restructuring related costs (in usd per share)	$ 0.05	$ 0.05			$ 0.05	$ 0.05
Asset impairment, exit costs and implementation costs		$ 78	71
Effect on future cash flow	$ 95
Asset impairment and exit costs			54
Pre-tax implementation costs			17
Payments for restructuring		58			$ 63
Facility Consolidation [Member] | Smokeable Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			25
Pre-tax implementation costs			3
Facility Consolidation [Member] | Smokeless Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			29
Pre-tax implementation costs			14
Facility Consolidation [Member] | Accelerated Depreciation And Asset Impairment [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring related costs	50	50			50	$ 50
Facility Consolidation [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring related costs	45	45			45	45
Facility Consolidation [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring related costs	$ 55	55			$ 55	55
Productivity Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs			132
Asset impairment and exit costs			125
Pre-tax implementation costs			$ 7
Payments for restructuring		$ 32				$ 106
Charges (in usd per share)			$ 0.04
Productivity Initiative [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			$ 5
Productivity Initiative [Member] | Smokeable Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			100
Pre-tax implementation costs			6
Productivity Initiative [Member] | Smokeless Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			13
Pre-tax implementation costs			1
Productivity Initiative [Member] | All Other [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			7
Productivity Initiative [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs			117
Productivity Initiative [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs			$ 15