XML 219 R127.htm IDEA: XBRL DOCUMENT v3.8.0.1
Financial structure and financial costs - Fair value hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial structure, financial costs and financial instruments      
Assets available for sale $ 1,727 $ 1,133 $ 1,241
Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Assets and liabilities held for trading 216 37 68
Assets available for sale 100 120 59
Total fair value (143) (2,847) (1,547)
Measured at fair value | Financial instruments, excluding commodity contracts | Level 1      
Financial structure, financial costs and financial instruments      
Assets available for sale 100 120 59
Total fair value 100 120 59
Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Assets and liabilities held for trading 216 37 68
Total fair value (243) (2,967) (1,606)
Hedging of Financial Debt (Fair value hedge) | Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Hedge instruments (599) (2,462) (1,723)
Hedging of Financial Debt (Fair value hedge) | Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Hedge instruments (599) (2,462) (1,723)
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts      
Financial structure, financial costs and financial instruments      
Hedge instruments 140 (542) 49
Cash flow hedge | Measured at fair value | Financial instruments, excluding commodity contracts | Level 2      
Financial structure, financial costs and financial instruments      
Hedge instruments $ 140 $ (542) $ 49