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Assets Held for Sale (Liabilities Held for Sale) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets and liabilites held for sale [Line Items]    
Trade payables $ 790 $ 644
Other current liabilities 595 708
Long-term employee provisions 640 576
Deferred tax liabilities 228 $ 303
Assets and liabilities held for sale [Member]    
Assets and liabilites held for sale [Line Items]    
Trade payables 9  
Other current liabilities 30  
Long-term employee provisions 1  
Deferred tax liabilities 3  
Lliabilities held for sale $ 43