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Financial Instruments (Narrative) (Details) $ in Billions				3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2019 CAD ($)	Mar. 07, 2019 CAD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 07, 2019 USD ($)	Mar. 07, 2019 CAD ($)
Derivative [Line Items]
Long-term debt					$ 28,042,000,000	$ 13,042,000,000
Unrealized gain (loss) on derivatives					(1,411,000,000)
Derivative, gain (loss) on derivative, net					(1,442,000,000)	0	$ 0
Equity Contract, Preemptive Rights [Member]
Derivative [Line Items]
Unrealized gain (loss) on derivatives					(434,000,000)
Equity Contract, Warrant [Member]
Derivative [Line Items]
Unrealized gain (loss) on derivatives					(977,000,000)
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, notional amount					2,246,000,000	1,226,000,000
Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Debt instrument, fair value disclosure					5,057,000,000
Long-term debt					4,741,000,000	0
Cronos [Member]
Derivative [Line Items]
Payments to acquire equity method investments and derivative instruments, investing	$ 1,800,000,000	$ 2.4	$ 2.4
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative asset, notional amount								$ 1,800,000,000	$ 2.4
Derivative, gain (loss) on derivative, net				$ (31,000,000)
Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Derivative [Line Items]
Long-term debt, fair value					30,700,000,000	12,500,000,000
Reported Value Measurement [Member]
Derivative [Line Items]
Long-term debt, fair value					$ 28,000,000,000.0	$ 13,000,000,000.0

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Nominal or face amount used to calculate payments on the derivative asset.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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