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Deconsolidation of RBH (Details)
$ in Millions, $ in Millions
6 Months Ended
Mar. 01, 2019
USD ($)
litigation_case
Mar. 01, 2019
CAD ($)
litigation_case
Jun. 30, 2019
USD ($)
litigation_case
Loss Contingencies [Line Items]      
Number of cases decided in favor of plaintiff | litigation_case     13
Smoking And Health Class Actions [Member] | Appellate Ruling [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member] | RBH [Member]      
Loss Contingencies [Line Items]      
Amount of litigation charge     $ 194.0
Canada [Member] | Smoking And Health Class Actions [Member] | Appellate Ruling [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member] | RBH [Member]      
Loss Contingencies [Line Items]      
Number of cases decided in favor of plaintiff | litigation_case 2 2  
Amount of litigation charge     194.0
Amount of litigation charge net of tax     $ 142.0
Amount of security ordered, funded by defendant $ 196.4 $ 257  
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member]      
Loss Contingencies [Line Items]      
Pending litigation liabilities measurement input     0.08
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Terminal Growth Rate [Member]      
Loss Contingencies [Line Items]      
Pending litigation liabilities measurement input     0.025
Marketing Administration And Research Costs [Member]      
Loss Contingencies [Line Items]      
Deconsolidation amount     $ 239.0
RBH [Member]      
Loss Contingencies [Line Items]      
Amount deconsolidated from balance sheet     3,519.0
Equity securities     3,280.0
Tax benefit for reversal of deferred tax liabilities     49.0
RBH [Member] | Cash [Member]      
Loss Contingencies [Line Items]      
Amount deconsolidated from balance sheet     1,323.0
RBH [Member] | Goodwill [Member]      
Loss Contingencies [Line Items]      
Amount deconsolidated from balance sheet     1,463.0
RBH [Member] | Other Comprehensive Earnings [Member]      
Loss Contingencies [Line Items]      
Amount deconsolidated from balance sheet     529.0
RBH [Member] | Other Assets and Liabilities [Member]      
Loss Contingencies [Line Items]      
Amount deconsolidated from balance sheet     $ 204.0