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Off balance sheet commitments and lease contracts - Leases reconciliation (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation between operating lease commitments under IAS 17 and IFRS 16      
Operating lease obligations     $ 9,130
Commitments relating to IFRS 16 exemptions:      
Lease obligations $ 8,943 $ 7,465  
Finance lease liabilities     1,878
Increase/decrease due to application of IFRS 16      
Commitments relating to IFRS 16 exemptions:      
Commitments for IFRS 16 exemptions     (417)
Low value assets     (90)
Short-term leases     (327)
Leases not yet commenced at January 1, 2019     (608)
Commitments relating to service component of lease contracts     (760)
Commitments relating to leases of non identified assets or substitute assets     (628)
Variable lease payments     (6)
Other impacts     204
Impact of discounting     (1,360)
Lease obligations     5,555
After application of IFRS 16      
Commitments relating to IFRS 16 exemptions:      
Lease obligations     $ 7,433