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Financial and other non-current assets (Details 2) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other non-current assets [abstract]    
Deferred compensation plans assets $ 471 $ 414
Prepaid post-employment benefit plans assets 202 148
Other non-current assets 219 176
Total other non-current assets $ 892 $ 738