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Financial assets and liabilities analysis per instrument class and strategy (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets $ 67,768 $ 72,163 $ 62,452
Total non-financial assets 188,994 170,468 168,526
Total assets 256,762 242,631 230,978
Fair value, financial assets 67,768 72,163 62,452
Total financial liabilities (93,333) (89,295) (90,157)
Total non-financial liabilities (163,429) (153,336) (140,821)
Total liabilities (256,762) (242,631) (230,978)
Fair value, financial liabilities (94,485) (90,840) (91,258)
Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (40,129) (41,340) (43,067)
Fair value, financial liabilities (41,281) (42,886) (44,168)
Accounts payable      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (26,134) (26,479) (23,227)
Fair value, financial liabilities (26,134) (26,479) (23,227)
Impact of offsetting on accounts payable 2,903 3,471 1,828
Other operating liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (13,286) (10,135) (9,616)
Fair value, financial liabilities (13,286) (10,135) (9,616)
Current borrowings      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (13,306) (11,096) (13,920)
Fair value, financial liabilities (13,306) (11,095) (13,920)
Other current financial liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (478) (245) (327)
Fair value, financial liabilities (478) (245) (327)
Loans to equity affiliates      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 4,755 5,135 4,718
Fair value, financial assets 4,755 5,135 4,718
Other investments      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 1,421 1,727 1,133
Fair value, financial assets 1,421 1,727 1,133
Non-current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 680 679 908
Fair value, financial assets 680 679 908
Other non-current assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 2,348 3,815 4,117
Fair value, financial assets 2,348 3,815 4,117
Accounts receivable, net      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 17,270 14,893 12,213
Fair value, financial assets 17,270 14,893 12,213
Impact of offsetting on accounts receivable (2,903) (3,471) (1,828)
Other operating receivables      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 9,733 9,336 10,218
Fair value, financial assets 9,733 9,336 10,218
Current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 3,654 3,393 4,548
Fair value, financial assets 3,654 3,393 4,548
Cash and cash equivalents      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 27,907 33,185 24,597
Fair value, financial assets 27,907 33,185 24,597
Amortized cost      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (87,514)    
Amortized cost | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (38,220)    
Amortized cost | Accounts payable      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (26,134)    
Amortized cost | Other operating liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (9,854)    
Amortized cost | Current borrowings      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (13,306)    
Fair value | Fair value through P&L      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (3,641)    
Fair value | Fair value through P&L | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (29)    
Fair value | Fair value through P&L | Other operating liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (3,429)    
Fair value | Fair value through P&L | Other current financial liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (183)    
Fair value | Fair value of instruments hedge      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (2,178)    
Fair value | Fair value of instruments hedge | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (1,880)    
Fair value | Fair value of instruments hedge | Other operating liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (3)    
Fair value | Fair value of instruments hedge | Other current financial liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities (295)    
Financial instruments related to financing and operational activities | Amortized cost      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (25,395) (20,888)
Financial instruments related to financing and operational activities | Amortized cost | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (18,470) (11,188)
Financial instruments related to financing and operational activities | Amortized cost | Current borrowings      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (6,925) (9,700)
Financial instruments related to financing and operational activities | Fair value | Hedging of Financial Debt (Fair value hedge)      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (1,108) (3,219)
Financial instruments related to financing and operational activities | Fair value | Hedging of Financial Debt (Fair value hedge) | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (951) (3,007)
Financial instruments related to financing and operational activities | Fair value | Hedging of Financial Debt (Fair value hedge) | Other current financial liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (157) (212)
Financial instruments related to financing and operational activities | Fair value | Cash flow hedge      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (131) (751)
Financial instruments related to financing and operational activities | Fair value | Cash flow hedge | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (131) (644)
Financial instruments related to financing and operational activities | Fair value | Cash flow hedge | Other operating liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities     (107)
Financial instruments related to financing and operational activities | Fair value | Held for trading      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (1,902) (2,121)
Financial instruments related to financing and operational activities | Fair value | Held for trading | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (20) (5)
Financial instruments related to financing and operational activities | Fair value | Held for trading | Other operating liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (1,794) (2,001)
Financial instruments related to financing and operational activities | Fair value | Held for trading | Other current financial liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (88) (115)
Financial instruments related to financing and operational activities | Fair value | Financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (25,939) (32,443)
Financial instruments related to financing and operational activities | Fair value | Financial debt | Non-current financial debt      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (21,768) (28,223)
Financial instruments related to financing and operational activities | Fair value | Financial debt | Current borrowings      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (4,171) (4,220)
Other financial instruments | Amortized cost      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (34,820) (30,735)
Other financial instruments | Amortized cost | Accounts payable      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (26,479) (23,227)
Other financial instruments | Amortized cost | Other operating liabilities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial liabilities   (8,341) (7,508)
Amortized cost      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 62,810    
Amortized cost | Loans to equity affiliates      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 4,755    
Amortized cost | Other non-current assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 2,348    
Amortized cost | Accounts receivable, net      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 17,270    
Amortized cost | Other operating receivables      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 6,994    
Amortized cost | Current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 3,536    
Amortized cost | Cash and cash equivalents      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 27,907    
Amortized cost | Financial instruments related to financing and operational activities      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   11,870 13,182
Amortized cost | Financial instruments related to financing and operational activities | Loans to equity affiliates      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   5,135 4,718
Amortized cost | Financial instruments related to financing and operational activities | Other non-current assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   3,765 4,051
Amortized cost | Financial instruments related to financing and operational activities | Current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   2,970 4,413
Amortized cost | Other financial instruments      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   55,425 44,599
Amortized cost | Other financial instruments | Accounts receivable, net      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   14,893 12,213
Amortized cost | Other financial instruments | Other operating receivables      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   7,347 7,789
Amortized cost | Other financial instruments | Cash and cash equivalents      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   33,185 24,597
Fair value | Fair value through P&L      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 3,930    
Fair value | Fair value through P&L | Other investments      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 1,059    
Fair value | Fair value through P&L | Non-current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 67    
Fair value | Fair value through P&L | Other operating receivables      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 2,731    
Fair value | Fair value through P&L | Current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 73    
Fair value | Fair value through OCI - equity instruments      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 362    
Fair value | Fair value through OCI - equity instruments | Other investments      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 362    
Fair value | Fair value of instruments hedge      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 666    
Fair value | Fair value of instruments hedge | Non-current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 613    
Fair value | Fair value of instruments hedge | Other operating receivables      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets 8    
Fair value | Fair value of instruments hedge | Current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets $ 45    
Fair value | Financial instruments related to financing and operational activities | Hedging of Financial Debt (Fair value hedge)      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   509 757
Fair value | Financial instruments related to financing and operational activities | Hedging of Financial Debt (Fair value hedge) | Non-current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   337 716
Fair value | Financial instruments related to financing and operational activities | Hedging of Financial Debt (Fair value hedge) | Current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   172 41
Fair value | Financial instruments related to financing and operational activities | Cash flow hedge      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   281 133
Fair value | Financial instruments related to financing and operational activities | Cash flow hedge | Non-current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   269 129
Fair value | Financial instruments related to financing and operational activities | Cash flow hedge | Other operating receivables      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   12 4
Fair value | Financial instruments related to financing and operational activities | Available for sale      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   1,777 1,199
Fair value | Financial instruments related to financing and operational activities | Available for sale | Other investments      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   1,727 1,133
Fair value | Financial instruments related to financing and operational activities | Available for sale | Other non-current assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   50 66
Fair value | Financial instruments related to financing and operational activities | Held for trading      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   2,301 2,582
Fair value | Financial instruments related to financing and operational activities | Held for trading | Non-current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   73 63
Fair value | Financial instruments related to financing and operational activities | Held for trading | Other operating receivables      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   1,977 2,425
Fair value | Financial instruments related to financing and operational activities | Held for trading | Current financial assets      
Financial assets and liabilities analysis per instrument class and strategy      
Total financial assets   $ 251 $ 94