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Pensions - Net pension liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 206 $ 214 $ 242
Losses (gains) from curtailment, settlement or plan amendment 3 20 15
Changes in notional contribution liability 56 55 51
Net pension liability (2,774) (2,990)  
Asset recognised as non-current pension assets (funded plan) 1,093 831  
Liability recognised as non-current pension liabilities (unfunded plans) (3,867) (3,820)  
Actual return on assets 527 1  
Funded Plan [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations, beginning balance 4,359    
Defined benefit obligations, ending balance 4,496 4,359  
Unfunded Plan [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations, beginning balance 3,817    
Defined benefit obligations, ending balance 3,867 3,817  
Defined benefit obligations [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligations, beginning balance 8,176 8,286  
Current service cost 206 214  
Interest cost 263 182  
Actuarial (gains) losses - Financial assumptions (23) 174  
Actuarial (gains) losses - Experience 6 (27)  
Benefits paid (236) (219)  
Losses (gains) from curtailment, settlement or plan amendment 0 (1)  
Paid-up policies (14) (18)  
Foreign currency translation (71) (469)  
Changes in notional contribution liability 56 55  
Defined benefit obligations, ending balance 8,363 8,176 8,286
Defined benefit plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Fair value of plan assets, beginning balance 5,187 5,687  
Interest income 143 136  
Return on plan assets (excluding interest income) 384 (135)  
Company contributions 127 49  
Benefits paid (195) (217)  
Paid-up policies and personal insurance (13) (18)  
Foreign currency translation (44) (315)  
Fair value of plan assets, ending balance $ 5,589 $ 5,187 $ 5,687