Investments in Unconsolidated Subsidiaries (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated subsidiaries	$ 1,080	$ 1,011
Difference between equity method investment carrying value and book value	874	867
Dividends from unconsolidated subsidiaries	$ 43	117
STAEM [Member] \| EITA [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	51.00%
STAEM [Member] \| Societe Nationale Des Tabacs Et Allumettes SpA. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Difference between equity method investment carrying value and book value, amortization period	10 years
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Difference between equity method investment carrying value and book value, amortization period	20 years
Equity Method Investment Goodwill [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated subsidiaries	$ 825	$ 810
EITA [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%
STAEM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Megapolis [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%

Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Amortization Period

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
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-Subparagraph (SX 210.7-04(10))
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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