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Supplemental Oil and Gas Information (Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows $ 27,439.0 $ 48,934.1 $ 50,150.5  
Future development costs (4,723.7) (6,882.7) (7,161.5)  
Future production costs (14,138.6) (18,724.3) (16,808.1)  
Future income taxes (1,060.7) (5,569.6) (6,696.2)  
Future net cash flows 7,516.0 17,757.5 19,484.7  
10% annual discount for estimated timing of cash flows (3,656.9) (7,852.3) (8,640.0)  
Standardized measure of discounted future net cash flows 3,859.1 9,905.2 10,844.7 $ 8,112.8
United States [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows 12,373.9 20,767.4 20,638.6  
Future development costs (2,620.5) (3,151.4) (3,833.9)  
Future production costs (4,955.4) (6,378.5) (5,244.7)  
Future income taxes (339.7) (2,930.1) (3,368.3)  
Future net cash flows 4,458.3 8,307.4 8,191.7  
10% annual discount for estimated timing of cash flows (2,430.0) (3,729.1) (4,020.2)  
Standardized measure of discounted future net cash flows 2,028.3 4,578.3 4,171.5  
Canada [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows 8,922.0 16,257.0 16,112.9  
Future development costs (1,145.4) (1,810.5) (1,882.3)  
Future production costs (5,892.7) (7,770.2) (7,073.0)  
Future income taxes (504.8) (1,389.6) (1,472.8)  
Future net cash flows 1,379.1 5,286.7 5,684.8  
10% annual discount for estimated timing of cash flows (666.8) (2,595.3) (2,999.1)  
Standardized measure of discounted future net cash flows 712.3 2,691.4 2,685.7  
Malaysia [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows 6,143.1 11,909.7 13,399.0  
Future development costs (957.8) (1,920.8) (1,445.3)  
Future production costs (3,290.5) (4,575.6) (4,490.4)  
Future income taxes (216.2) (1,249.9) (1,855.1)  
Future net cash flows 1,678.6 4,163.4 5,608.2  
10% annual discount for estimated timing of cash flows (560.1) (1,527.9) (1,620.7)  
Standardized measure of discounted future net cash flows $ 1,118.5 $ 2,635.5 $ 3,987.5