Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended	150 Months Ended
	May 31, 2016	May 31, 2001	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2017
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period			$ 47	$ 132
Payments			(1)	(17)
Accrued liability for tobacco and health litigation items at end of period			47	153	$ 132	$ 47
Aspinall [Member]
Loss Contingencies [Line Items]
Litigation settlement interest expense (income)				10
Interest Expense Related To Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges			0	2
Tobacco and Health Judgment [Member]
Loss Contingencies [Line Items]
Judgments paid						474
Litigation settlement interest expense (income)						183
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges			1	4
Aspinall [Member]
Loss Contingency Accrual [Roll Forward]
Payments	$ (32)
Aspinall [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges			0	32
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Judgments paid						83
Litigation settlement interest expense (income)						21
PM USA [Member] | Aspinall [Member]
Loss Contingency Accrual [Roll Forward]
Pre-tax charges				$ 32
PM USA [Member] | Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Payments made		$ 500
PM USA [Member] | Engle Progeny Cases, Federal [Member]
Loss Contingencies [Line Items]
Payments made					$ 43	43
Other Assets [Member] | Pending Litigation [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Security posted for appeal of judgments			$ 92			$ 92