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New Accounting Standards (Revenue Recognition) (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net revenues $ 21,100 $ 19,319 $ 39,526 $ 35,875    
Excises taxes 13,374 12,402 24,904 22,894    
Net revenues $ 7,726 6,917 $ 14,622 12,981    
Number of reportable segments | segment     6      
Revenue, Excluding Assessed Tax [Member] | Customer Concentration Risk [Member] | East Asia and Australia [Member] | Customer One [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Concentration risk percentage         16.00% 11.00%
Revenue, Excluding Assessed Tax [Member] | Customer Concentration Risk [Member] | European Union [Member] | Customer One [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Concentration risk percentage         10.00% 11.00%
Indonesia [Member] | Revenue, Including Assessed Tax [Member] | Geographic Concentration Risk [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net revenues         $ 8,000 $ 7,700
Indonesia [Member] | Revenue, Excluding Assessed Tax [Member] | Geographic Concentration Risk [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net revenues         3,200 3,200
Germany [Member] | Revenue, Including Assessed Tax [Member] | Geographic Concentration Risk [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net revenues         7,200 7,100
Japan [Member] | Revenue, Excluding Assessed Tax [Member] | Geographic Concentration Risk [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net revenues         $ 4,700 $ 2,800
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net revenues   19,319   35,875    
Excises taxes   $ 12,402   $ 22,894