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Segment Information by geographical area (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment information by geographical area      
Non-Group sales $ 171,493 $ 149,743 $ 165,357
Property, plant and equipment, intangible assets, net 123,984 127,333 124,067
Capital expenditures 16,896 20,530 28,033
France      
Segment information by geographical area      
Non-Group sales 39,032 33,472 36,536
Property, plant and equipment, intangible assets, net 6,397 5,361 4,123
Capital expenditures 1,193 1,835 980
Rest of Europe      
Segment information by geographical area      
Non-Group sales 83,255 71,551 79,463
Property, plant and equipment, intangible assets, net 18,260 20,647 22,354
Capital expenditures 2,805 3,842 4,783
North America      
Segment information by geographical area      
Non-Group sales 16,889 15,383 14,857
Property, plant and equipment, intangible assets, net 18,469 19,154 17,169
Capital expenditures 2,916 2,825 3,493
Africa      
Segment information by geographical area      
Non-Group sales 17,581 15,294 17,612
Property, plant and equipment, intangible assets, net 42,849 45,032 43,536
Capital expenditures 5,030 6,859 9,154
Rest of the world      
Segment information by geographical area      
Non-Group sales 14,736 14,043 16,889
Property, plant and equipment, intangible assets, net 38,009 37,139 36,885
Capital expenditures $ 4,952 $ 5,169 $ 9,623