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Performance B.4.1. Share-based compensation - Plan awards and shares expected to vest (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Shares issued (in shares) (364,157) (326,883)    
Shares still expected to vest (in shares) 622,567 570,404    
2020 Performance Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 341,897      
Additional shares granted (in shares) 0      
Revision for forfeitures (in shares) (13,008)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 328,889      
Shares issued (in shares) 0      
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 328,889      
Estimated cost over the vesting period | $ $ 13      
2020 Deferred Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 370,131      
Additional shares granted (in shares) 5,928      
Revision for forfeitures (in shares) (9,880)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 366,179      
Shares issued (in shares) (3,571)      
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 362,608      
Estimated cost over the vesting period | $ $ 15      
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) (35,558)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 222,043      
Shares issued (in shares) (17) (150)    
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 221,876      
Estimated cost over the vesting period | $ $ 11      
2019 Deferred Plan        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Initial shares granted (in shares) 297,856      
Additional shares granted (in shares) 43,115      
Revision for forfeitures (in shares) (22,636)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 318,335      
Shares issued (in shares) (96,629) (24,294)    
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 197,412      
Estimated cost over the vesting period | $ $ 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) (43,639)      
Revision for cancellations (in shares) (4,728)      
Total before issuances (in shares) 188,829      
Shares issued (in shares) (304) (3,109) (97)  
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 185,319      
Estimated cost over the vesting period | $ $ 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) (37,433)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 228,174      
Shares issued (in shares) (35,125) (54,971) (18,747)  
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 119,331      
Estimated cost over the vesting period | $ $ 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) (50,279)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 232,396      
Shares issued (in shares) (158,394) (19,143) (2,724) 0
Performance conditions (in shares) (52,135)      
Shares still expected to vest (in shares) 0      
Estimated cost over the vesting period | $ $ 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) (89,011)      
Revision for cancellations (in shares) 0      
Total before issuances (in shares) 378,900      
Shares issued (in shares) (194,329) (82,486) (99,399) (2,686)
Performance conditions (in shares) 0      
Shares still expected to vest (in shares) 0      
Estimated cost over the vesting period | $ $ 20