Line items represent reporting 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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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Investments in Equity Securities (Investment in Cronos Narrative) (Details) $ / shares in Units, shares in Millions, $ in Billions			3 Months Ended
	Mar. 08, 2019 USD ($) shares	Mar. 08, 2019 CAD ($)	Mar. 31, 2019 USD ($) director board_member shares	Mar. 31, 2018 USD ($)	Mar. 08, 2019 $ / shares
Investment [Line Items]
Payments to acquire equity method investments			$ 1,831,000,000
Earnings/losses from equity method investments			$ 86,000,000	$ 342,000,000
Cronos Group Inc. [Member]
Investment [Line Items]
Number of ordinary shares owned (approximately) (in shares) \| shares	149.8
Ownership percentage (approximately)	45.00%		45.00%
Equity method investments, purchase price	$ 1,800,000,000	$ 2.4
Equity method investment, warrant exercised, ownership percentage (approximately)	55.00%	55.00%
Payments to acquire equity method investments	$ 400,000,000
Payments for deferred tax liability	300,000,000
Earnings/losses from equity method investments			$ 0
Number of directors nominated \| director			4
Number of members on the Board of Directors \| board_member			7
Equity Contract, Preemptive Rights [Member] \| Cronos Group Inc. [Member]
Investment [Line Items]
Equity method investment, shares purchased, (CAD per share) \| $ / shares					$ 16.25
Equity method investment, number of shares eligible for purchase (in shares) \| shares			40.0
Payments for derivative instrument, investing activities	$ 500,000,000
Equity Contract, Warrant [Member] \| Cronos Group Inc. [Member]
Investment [Line Items]
Equity method investment, shares purchased, (CAD per share) \| $ / shares					$ 19.00
Equity method investment, number of shares eligible for purchase (in shares) \| shares	74.0
Payments for derivative instrument, investing activities	$ 1,200,000,000