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Financial Instruments (Narrative) (Details)
$ in Millions, $ in Billions
3 Months Ended 6 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Derivative [Line Items]                  
(Gain) loss on Cronos-related financial instruments     $ (40) $ 266   $ 97 $ 691    
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]                  
Derivative [Line Items]                  
Derivative asset, notional amount $ 1,800       $ 1,800       $ 2.4
(Gain) loss on Cronos-related financial instruments         $ 31        
Cronos Group Inc. [Member]                  
Derivative [Line Items]                  
Equity method investments, purchase price $ 1,800 $ 2.4              
Foreign Currency Denominated Debt [Member]                  
Derivative [Line Items]                  
Debt instrument, fair value disclosure     5,000     5,000   $ 5,057  
Long-term debt     4,753     4,753   4,741  
Net Investment Hedging [Member] | Foreign currency contracts [Member]                  
Derivative [Line Items]                  
Derivative, notional amount     1,402     1,402   2,246  
Reported Value Measurement [Member]                  
Derivative [Line Items]                  
Long-term debt, fair value     29,000     29,000   28,000  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]                  
Derivative [Line Items]                  
Long-term debt, fair value     $ 33,100     $ 33,100   $ 30,700