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Fair values - Fair value hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Assets.    
Available-for-sale securities in "Marketable securities and short-term investments" $ 1,633 $ 1,325
Derivative assets-non-current in "Other non-current assets" 186 189
Liabilities    
Derivative liabilities-current in "Other current liabilities" 318 438
Derivative liabilities-non-current in "Other non-current liabilities" 134 108
Recurring    
Assets.    
Derivative assets-current in "Other current assets" 297 289
Derivative assets-non-current in "Other non-current assets" 186 189
Total financial assets, fair value 1,792 1,463
Liabilities    
Derivative liabilities-current in "Other current liabilities" 318 438
Derivative liabilities-non-current in "Other non-current liabilities" 134 108
Total financial liabilities, fair value 452 546
Equity securities | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Marketable securities and short-term investments" 667 110
Debt securities - U.S. government obligations | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Marketable securities and short-term investments" 121 136
Debt securities - Other government obligations | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Marketable securities and short-term investments" 2 2
Debt securities - Corporate | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Cash and equivalents" 11 85
Available-for-sale securities in "Marketable securities and short-term investments" 508 652
Level 1 | Recurring    
Assets.    
Derivative assets-current in "Other current assets" 1  
Total financial assets, fair value 122 136
Liabilities    
Derivative liabilities-current in "Other current liabilities" 3  
Total financial liabilities, fair value 3  
Level 1 | Debt securities - U.S. government obligations | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Marketable securities and short-term investments" 121 136
Level 2 | Recurring    
Assets.    
Derivative assets-current in "Other current assets" 296 289
Derivative assets-non-current in "Other non-current assets" 186 189
Total financial assets, fair value 1,670 1,327
Liabilities    
Derivative liabilities-current in "Other current liabilities" 315 438
Derivative liabilities-non-current in "Other non-current liabilities" 134 108
Total financial liabilities, fair value 449 546
Level 2 | Equity securities | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Marketable securities and short-term investments" 667 110
Level 2 | Debt securities - Other government obligations | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Marketable securities and short-term investments" 2 2
Level 2 | Debt securities - Corporate | Available-for-sale securities | Recurring    
Assets.    
Available-for-sale securities in "Cash and equivalents" 11 85
Available-for-sale securities in "Marketable securities and short-term investments" $ 508 $ 652