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Segment Reporting (Schedule of Pre-tax Tobacco and Health Litigation Charges) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Pre-tax Tobacco and Health Litigation Charges [Line Items]
Provision related to litigation recorded	$ 7	$ 34	$ 18	$ 24	$ 29	$ 3	$ 28	$ 17
Tobacco and Health Litigation Cases [Member]
Schedule of Pre-tax Tobacco and Health Litigation Charges [Line Items]
Provision related to litigation recorded									$ 83	$ 77	$ 131
Tobacco and Health Litigation Cases [Member] | Operating Income (Loss) [Member] | Operating Segments [Member] | Oral Tobacco Products [Member]
Schedule of Pre-tax Tobacco and Health Litigation Charges [Line Items]
Provision related to litigation recorded									0	0	10
Tobacco and Health Litigation Cases [Member] | Interest And Other Debt Expense, Net [Member] | Segment Reconciling Items [Member]
Schedule of Pre-tax Tobacco and Health Litigation Charges [Line Items]
Provision related to litigation recorded									4	5	18
PM USA [Member] | Tobacco and Health Litigation Cases [Member] | Operating Income (Loss) [Member] | Operating Segments [Member] | Smokeable Products [Member]
Schedule of Pre-tax Tobacco and Health Litigation Charges [Line Items]
Provision related to litigation recorded									$ 79	$ 72	$ 103

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[Line Items] for Schedule of Pre-tax Tobacco and Health Litigation Charges [Table]

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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