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Equity (Details 4) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of changes in equity [abstract]      
Treasury shares acquired to be cancelled (32.6) (60.3) (23.3)
Shares acquired for cancellation, equity impact $ (2,897) $ (5,351) $ (1,859)
Other share purchases (1.7) (1.7) (1.2)
Other share purchases, equity impact $ (159) $ (160) $ (114)
Purchase of treasury shares (34.3) (62.0) (24.5)
Purchase of treasury shares, equity impact $ (3,056) $ (5,511) $ (1,973)
Other share sales     3.0
Other share sales, equity impact     $ 263
Exercise of options and employee transactions shares 14.7 5.5 7.8
Exercise of options and employee transactions, equity impact $ 806 $ 210 $ 434
Equity based compensation shares 11.0 9.4 7.4
Equity-based compensation, equity impact $ 730 $ 833 $ 756
Shares delivered to divested business employees 0.4 0.9  
Shares delivered to divested business employees, equity impact $ 30 $ 18  
Total number of outstanding treasury shares (8.2) (46.2) (6.3)
Total equity impact of treasury share movements $ (1,490) $ (4,450) $ (520)