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Employee benefits - Costs recognized in the income statement (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Overfunded pension plans      
Costs recognized in the income statement      
Service cost $ 10 $ 7 $ 7
Interest on expense on liabilities 196 222 317
Interest income on plan assets (253) (297) (432)
Interest expense on effect of (asset ceiling)/ onerous liability 58 74 114
Total of cost, net 11 6 6
Underfunded pension plans      
Costs recognized in the income statement      
Service cost 68 52 55
Interest on expense on liabilities 122 134 153
Interest income on plan assets (102) (107) (123)
Total of cost, net 88 79 85
Other benefits      
Costs recognized in the income statement      
Service cost 1 18 10
Interest on expense on liabilities 33 64 57
Total of cost, net $ 34 $ 82 $ 67