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Off Balance sheet commitments and lease contracts - Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Lease contracts      
Total minimum operating lease payments $ 6,441 $ 6,478 $ 5,973
Total minimum finance lease payments 1,204 393 391
Less financial expenses (48) (74) (55)
Nominal value of finance lease contracts 1,156 319 336
Less current portion of finance lease contracts (39) (8) (41)
Non-current finance lease liabilities 1,117 311 295
Rental expense      
Net rental expense incurred under operating leases 1,467 1,629 1,282
Not later than one year      
Lease contracts      
Total minimum operating lease payments 1,401 1,582 1,430
Total minimum finance lease payments 76 24 57
Nominal value of finance lease contracts 39 8 41
Year 2      
Lease contracts      
Total minimum operating lease payments 988 1,054 1,049
Total minimum finance lease payments 67 26 23
Year 3      
Lease contracts      
Total minimum operating lease payments 814 777 784
Total minimum finance lease payments 67 44 23
Year 4      
Lease contracts      
Total minimum operating lease payments 623 687 550
Total minimum finance lease payments 65 27 23
Year 5      
Lease contracts      
Total minimum operating lease payments 462 435 442
Total minimum finance lease payments 65 25 23
More than 5 years      
Lease contracts      
Total minimum operating lease payments 2,153 1,943 1,718
Total minimum finance lease payments 864 247 242
Nominal value of finance lease contracts $ 856 $ 208 $ 214