Contingencies Contingencies (Judgments Recorded and Paid) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingency Accrual [Roll Forward]
Accrued liability for tobacco and health litigation items at beginning of period				$ 39				$ 3	$ 39	$ 3	$ 0
Payments									(57)	(8)	(19)
Accrued liability for tobacco and health litigation items at end of period	$ 132				$ 39				132	39	3
Interest Expense Related To Litigation [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded									23	2	4
Implementation of Corrective Communications [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded									0	31	0
Tobacco and Health Judgment [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded	$ 35	$ 67	$ 5	$ 43	$ 5	$ 4	$ 31	$ 4
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded									84	11	18
Engle Progeny Cases, Federal [Member] | Litigation Cases Results [Member]
Loss Contingency Accrual [Roll Forward]
Provision related to litigation recorded									$ 43	$ 0	$ 0