v3.3.1.900
Income, Sales-Based And Other Taxes (Remaining Tax Years Subject To Examination By Major Tax Jurisdiction) (Details)
 12 Months Ended
Dec. 31, 2015
Abu Dhabi [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Abu Dhabi [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2012
Angola [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Angola [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2009
Australia First Range [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2005
Australia First Range [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2005
Australia Second Range [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Australia Second Range [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2008
Canada [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Canada [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2008
Equatorial Guinea [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Equatorial Guinea [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2007
Malaysia [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Malaysia [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2009
Nigeria [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Nigeria [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2005
Norway [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Norway [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2007
Qatar [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Qatar [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2009
Russia [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
Russia [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2012
United Kingdom [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
United Kingdom [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2011
United States [Member] | Maximum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2015
United States [Member] | Minimum [Member]  
Income, Sales-Based and Other Taxes [Line Items]  
Open tax years by major tax jurisdiction 2006