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Contingencies (Judgments Paid and Provisions for Tobacco and Health Litigation) (Details)
$ in Millions
 3 Months Ended 12 Months Ended 183 Months Ended
Dec. 31, 2019
USD ($)
case
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
case
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
case
Loss Contingency Accrual [Roll Forward]                        
Accrued liability for tobacco and health litigation items at beginning of period       $ 112       $ 106 $ 112 $ 106 $ 47  
Provision related to litigation recorded $ 29 $ 3 $ 28 $ 17 $ 12 $ 21 $ 70 $ 28        
Payments                 (175) (125) (21)  
Accrued liability for tobacco and health litigation items at end of period 14       $ 112       14 112 106 $ 14
Interest Expense Related to Litigation [Member]                        
Loss Contingency Accrual [Roll Forward]                        
Provision related to litigation recorded                 5 18 8  
Pre-Trial Resolution [Member]                        
Loss Contingency Accrual [Roll Forward]                        
Payments                 (20)      
Accrued liability for tobacco and health litigation items at end of period $ 2               2     2
Tobacco and Health Judgment [Member]                        
Loss Contingencies [Line Items]                        
Judgments paid (approximately)                       724
Interest and other debt expense, net                       $ 214
Tobacco and Health Judgment [Member] | Litigation Cases Results [Member]                        
Loss Contingency Accrual [Roll Forward]                        
Provision related to litigation recorded                 72 $ 113 $ 72  
Tobacco and Health Judgment [Member] | Pre-Trial Resolution [Member]                        
Loss Contingency Accrual [Roll Forward]                        
Provision related to litigation recorded                 $ 22      
Number of pre-trial resolution cases | case 300               300     300
Engle Progeny Cases [Member]                        
Loss Contingencies [Line Items]                        
Judgments paid (approximately)                       $ 312
Interest and other debt expense, net                       52
Assets [Member] | Pending Litigation [Member] | PM USA [Member]                        
Loss Contingency Accrual [Roll Forward]                        
Security posted for appeal of judgments $ 43               $ 43     $ 43