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Income Taxes - Deferred tax balance sheet presentation (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred taxes presented on the balance sheet        
Deferred tax assets, non-current $ 5,206 $ 4,368 $ 3,982  
Deferred tax liabilities, non-current (10,828) (11,060) (12,360)  
Net deferred tax liability $ (5,622) $ (6,692) $ (8,378) $ (10,731)