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Shareholders' Equity - Share repurchase program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Class of Stock [Line Items]      
Aggregate cost of shares repurchased $ 0 $ 586 $ 1,234
Number of shares repurchased (shares) 0.0 12.9 31.5
Average price per share repurchased $ 0 $ 45.44 $ 39.20
Common shares held in treasury (shares) 218.5 217.9 204.4
Common shares held in treasury, at cost $ 4,424 $ 4,378  
Common shares      
Class of Stock [Line Items]      
Remaining share repurchase authorization $ 1,000    
Cumulative number of shares acquired since inception of share repurchase program 433.6    
Aggregate purchase price of shares acquired since inception of share repurchase program $ 5,900