Segment Reporting (Schedule of Pre-tax Tobacco and Health Litigation Items) (Details) - Tobacco and Health Litigation Cases [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Provision related to litigation recorded	$ 1	$ 38
Operating Segments [Member] \| Smokeable Products [Member] \| Operating Income (Loss) [Member]
Segment Reporting Information [Line Items]
Provision related to litigation recorded	1	26
Segment Reconciling Items [Member] \| Interest And Other Debt Expense, Net [Member]
Segment Reporting Information [Line Items]
Provision related to litigation recorded	$ 0	$ 12

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualProvision
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration