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Pensions - Net pension liability (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 209 $ 184 $ 206
Past service cost 3 0 0
Losses (gains) from curtailment, settlement or plan amendment 0 0 3
Changes in notional contribution liability 60 55 56
Net pension liability (2,954) (2,981)  
Represented by      
Asset recognised as non-current pension assets (funded plan) 1,449 1,310 1,093
Liability recognised as non-current pension liabilities (unfunded plans) (4,403) (4,292) (3,867)
Actual return on assets 397 501  
Funded Plan [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations, beginning balance 4,927    
Defined benefit obligations, ending balance 4,959 4,927  
Represented by      
DBO specified by funded and unfunded pension plans 4,959 4,927  
Unfunded Plan [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations, beginning balance 4,288    
Defined benefit obligations, ending balance 4,400 4,288  
Represented by      
DBO specified by funded and unfunded pension plans 4,400 4,288  
Defined benefit obligations [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations, beginning balance 9,216 8,363  
Current service cost 208 184  
Interest cost 238 203  
Actuarial (gains) losses - Financial assumptions 294 443  
Actuarial (gains) losses - Experience (66) (61)  
Past service cost 3 0  
Benefits paid (295) (250)  
Paid-up policies 0 (7)  
Foreign currency translation (300) 286  
Changes in notional contribution liability 60 55  
Defined benefit obligations, ending balance 9,358 9,216 8,363
Represented by      
DBO specified by funded and unfunded pension plans 9,358 9,216 8,363
Defined benefit plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Fair value of plan assets, beginning balance 6,234 5,589  
Interest income 106 117  
Return on plan assets (excluding interest income) 291 385  
Company contributions 114 96  
Benefits paid (137) (113)  
Paid-up policies 0 (7)  
Foreign currency translation (204) 167  
Fair value of plan assets, ending balance $ 6,404 $ 6,234 $ 5,589