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Performance B.4.1. Share-based compensation - Plan awards and shares expected to vest (Details)
$ in Millions
 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Shares issued (in shares) (326,883) (207,092)          
Shares still expected to vest (in shares) 570,404 512,211     570,404 570,404 570,404
2019 Performance Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares) 257,601            
Additional shares granted (in shares) 0            
Revision for forfeitures (in shares) (17,182)            
Revision for cancellations (in shares) 0            
Total before issuances (in shares) 240,419            
Shares issued (in shares) (150)            
Shares still expected to vest (in shares) 240,269       240,269 240,269 240,269
Estimated cost over the vesting period | $ $ 11       $ 11 $ 11 $ 11
2019 Deferred Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares) 320,840            
Additional shares granted (in shares) 20,131            
Revision for forfeitures (in shares) (9,198)            
Revision for cancellations (in shares) 0            
Total before issuances (in shares) 331,773            
Shares issued (in shares) (24,294)            
Shares still expected to vest (in shares) 307,479       307,479 307,479 307,479
Estimated cost over the vesting period | $ $ 18       $ 18 $ 18 $ 18
2018 Performance Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares)   237,196          
Additional shares granted (in shares)         0    
Revision for forfeitures (in shares)         (27,494)    
Revision for cancellations (in shares)         (4,728)    
Total before issuances (in shares)         204,974    
Shares issued (in shares) (3,109) (97)          
Shares still expected to vest (in shares) 201,768       201,768 201,768 201,768
Estimated cost over the vesting period | $ $ 12       $ 12 $ 12 $ 12
2018 Deferred Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares)   262,317          
Additional shares granted (in shares)         3,290    
Revision for forfeitures (in shares)         (26,860)    
Revision for cancellations (in shares)         0    
Total before issuances (in shares)         238,747    
Shares issued (in shares) (54,971) (18,747)          
Shares still expected to vest (in shares) 165,029       165,029 165,029 165,029
Estimated cost over the vesting period | $ $ 14       $ 14 $ 14 $ 14
2017 Performance Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares)     279,807        
Additional shares granted (in shares)           2,868  
Revision for forfeitures (in shares)           (40,946)  
Revision for cancellations (in shares)           0  
Total before issuances (in shares)           241,729  
Shares issued (in shares) (19,143) (2,724) 0        
Shares still expected to vest (in shares) 219,862       219,862 219,862 219,862
Estimated cost over the vesting period | $ $ 10       $ 10 $ 10 $ 10
2017 Deferred Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares)     438,505        
Additional shares granted (in shares)           29,406  
Revision for forfeitures (in shares)           (88,437)  
Revision for cancellations (in shares)           0  
Total before issuances (in shares)           379,474  
Shares issued (in shares) (82,486) (99,399) (2,686)        
Shares still expected to vest (in shares) 194,903       194,903 194,903 194,903
Estimated cost over the vesting period | $ $ 20       $ 20 $ 20 $ 20
2016 Performance Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares)       200,617      
Additional shares granted (in shares)             0
Revision for forfeitures (in shares)             (49,164)
Revision for cancellations (in shares)             0
Total before issuances (in shares)             151,453
Shares issued (in shares) (149,487) (752) (1,214)        
Shares still expected to vest (in shares) 0       0 0 0
Estimated cost over the vesting period | $ $ 8       $ 8 $ 8 $ 8
2016 Deferred Plan              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Initial shares granted (in shares)       287,316      
Additional shares granted (in shares)             0
Revision for forfeitures (in shares)             (78,253)
Revision for cancellations (in shares)             0
Total before issuances (in shares)             209,063
Shares issued (in shares) (163,751) (43,579) (1,733)        
Shares still expected to vest (in shares) 0       0 0 0
Estimated cost over the vesting period | $ $ 12       $ 12 $ 12 $ 12