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Supplemental Oil and Gas Information (Summary of Proved Reserves Based on Average Prices) (Details)
bbl in Millions, MMBbls in Millions, ft³ in Billions
 12 Months Ended
Dec. 31, 2018
MMcf
bbl
ft³
MMBbls
Dec. 31, 2018
bbl
ft³
MMBbls
Dec. 31, 2018
bbl
ft³
MMBbls
Dec. 31, 2018
bbl
ft³
MMBbls
Dec. 31, 2017
ft³
MMBbls
Dec. 31, 2016
ft³
MMBbls
Dec. 31, 2015
ft³
MMBbls
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       328.1 329.0 456.2  
Revisions of previous estimates       (15.3) (6.0) (5.8)  
Improved recovery       0.8 2.0    
Extensions and discoveries       58.9 31.6 11.0  
Purchases of properties       93.6 4.7 26.3  
Sales of properties           (121.0)  
Production       (33.6) (33.2) (37.7)  
Proved developed and undeveloped reserves, Ending Balance       432.5 [1] 328.1 329.0  
Proved developed reserves 249.3 [2] 249.3 [2] 249.3 [2] 249.3 [2] 185.5 184.9 326.6
Proved undeveloped reserves 183.2 [3] 183.2 [3] 183.2 [3] 183.2 [3] 142.6 144.1 129.6
Crude Oil [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       328.1 329.0 341.4  
Revisions of previous estimates       (15.3) (6.0) (5.8)  
Improved recovery       0.8 2.0    
Extensions and discoveries       58.9 31.6 11.0  
Purchases of properties       93.6 4.7 26.3  
Sales of properties           (7.8)  
Production       (33.6) (33.2) (36.1)  
Proved developed and undeveloped reserves, Ending Balance       432.5 [1] 328.1 329.0  
Proved developed reserves 249.3 [2] 249.3 [2] 249.3 [2] 249.3 [2] 185.5 184.9 211.8
Proved undeveloped reserves 183.2 [3] 183.2 [3] 183.2 [3] 183.2 [3] 142.6 144.1 129.6
Natural Gas Liquids [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       48.9 42.5 36.4  
Revisions of previous estimates       (6.2) 1.3 1.6  
Extensions and discoveries       12.0 7.8 2.9  
Purchases of properties       3.0 0.5 5.1  
Production       (3.5) (3.2) (3.5)  
Proved developed and undeveloped reserves, Ending Balance       54.2 [4] 48.9 42.5  
Proved developed reserves 27.3 [5] 27.3 [5] 27.3 [5] 27.3 [5] 24.6 22.2 21.6
Proved undeveloped reserves 26.9 [6] 26.9 [6] 26.9 [6] 26.9 [6] 24.3 20.3 14.8
Natural Gas [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance | ft³     1,927.1   1,878.0 1,688.8  
Revisions of previous estimates | ft³     (1.8)   (5.4) 43.3  
Improved recovery | ft³     0.6     164.2  
Extensions and discoveries | ft³     310.3   190.6 122.3  
Purchases of properties | ft³     61.7   4.0    
Sales of properties | ft³           (2.2)  
Production | ft³     (154.3)   (140.1) (138.4)  
Proved developed and undeveloped reserves, Ending Balance | ft³     2,143.6 [7]   1,927.1 1,878.0  
Proved developed reserves | ft³ 921.6 [8] 921.6 [8] 921.6 [8] 921.6 [8] 819.3 818.1 783.5
Proved undeveloped reserves | ft³ 1,222.0 [9] 1,222.0 [9] 1,222.0 [9] 1,222.0 [9] 1,107.8 1,059.9 905.3
MP Gulf Of Mexico LLC [Member] | Crude Oil And Condensate [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped reserves, Ending Balance | bbl   25.5          
Proved developed reserves | bbl 19.1 19.1 19.1 19.1      
Proved undeveloped reserves | bbl 6.4 6.4 6.4 6.4      
MP Gulf Of Mexico LLC [Member] | Natural Gas Liquids [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped reserves, Ending Balance | bbl   1.1          
Proved developed reserves | bbl 0.8 0.8 0.8 0.8      
Proved undeveloped reserves | bbl 0.3 0.3 0.3 0.3      
MP Gulf Of Mexico LLC [Member] | Natural Gas [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped reserves, Ending Balance | ft³     10.8        
Proved developed reserves | ft³ 8.2 8.2 8.2 8.2      
Proved undeveloped reserves | ft³ 2.6 2.6 2.6 2.6      
United States [Member] | Crude Oil [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       224.7 214.4 238.9  
Revisions of previous estimates       (15.0) (4.7) (10.9)  
Extensions and discoveries       42.9 27.2 8.6  
Purchases of properties       92.3 4.7    
Sales of properties           (4.5)  
Production       (18.4) (16.9) (17.7)  
Proved developed and undeveloped reserves, Ending Balance       326.5 [1] 224.7 214.4  
Proved developed reserves 189.0 [2] 189.0 [2] 189.0 [2] 189.0 [2] 126.3 113.9 125.9
Proved undeveloped reserves 137.5 [3] 137.5 [3] 137.5 [3] 137.5 [3] 98.4 100.5 113.0
United States [Member] | Natural Gas Liquids [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       43.0 36.4 35.4  
Revisions of previous estimates       (5.3) 2.0 1.2  
Extensions and discoveries       9.7 7.0 2.8  
Purchases of properties       3.0 0.5    
Production       (2.8) (2.9) (3.0)  
Proved developed and undeveloped reserves, Ending Balance       47.6 [4] 43.0 36.4  
Proved developed reserves 24.9 [5] 24.9 [5] 24.9 [5] 24.9 [5] 23.3 20.8 20.7
Proved undeveloped reserves 22.7 [6] 22.7 [6] 22.7 [6] 22.7 [6] 19.7 15.6 14.7
United States [Member] | Natural Gas [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance | ft³     223.3   219.4 232.4  
Revisions of previous estimates | ft³     37.6   (16.0) 0.1  
Improved recovery | ft³           6.4  
Extensions and discoveries | ft³     44.7   32.2    
Purchases of properties | ft³     20.3   4.0    
Sales of properties | ft³           (0.1)  
Production | ft³     (16.9)   (16.3) (19.4)  
Proved developed and undeveloped reserves, Ending Balance | ft³     309.0 [7]   223.3 219.4  
Proved developed reserves | ft³ 198.3 [8] 198.3 [8] 198.3 [8] 198.3 [8] 127.7 138.7 148.3
Proved undeveloped reserves | ft³ 110.7 [9] 110.7 [9] 110.7 [9] 110.7 [9] 95.6 80.7 84.1
Canada [Member] | Crude Oil [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       51.5 48.9 27.9  
Revisions of previous estimates       (8.0) 2.3 2.5  
Extensions and discoveries       16.0 4.4    
Purchases of properties           26.3  
Sales of properties           (3.3)  
Production       (4.5) (4.1) (4.5)  
Proved developed and undeveloped reserves, Ending Balance       55.0 [1] 51.5 48.9  
Proved developed reserves 23.3 [2] 23.3 [2] 23.3 [2] 23.3 [2] 21.9 19.2 23.8
Proved undeveloped reserves 31.7 [3] 31.7 [3] 31.7 [3] 31.7 [3] 29.6 29.7 4.1
Canada [Member] | Synthetic Oil [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance [10]         0.0 114.8  
Sales of properties [10]           (113.2)  
Production [10]           (1.6)  
Proved developed and undeveloped reserves, Ending Balance [10]           0.0  
Proved developed reserves [10]             114.8
Canada [Member] | Natural Gas Liquids [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       5.6 5.6 0.4  
Revisions of previous estimates       (1.6) (0.6) 0.2  
Extensions and discoveries       2.3 0.8 0.1  
Purchases of properties           5.1  
Production       (0.4) (0.2) (0.2)  
Proved developed and undeveloped reserves, Ending Balance       5.9 [4] 5.6 5.6  
Proved developed reserves 1.7 [5] 1.7 [5] 1.7 [5] 1.7 [5] 1.0 0.9 0.3
Proved undeveloped reserves 4.2 [6] 4.2 [6] 4.2 [6] 4.2 [6] 4.6 4.7 0.1
Canada [Member] | Natural Gas [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance | ft³     1,212.4   1,118.9 909.6  
Revisions of previous estimates | ft³     (51.2)   19.4 45.3  
Improved recovery | ft³           120.2  
Extensions and discoveries | ft³     261.0   156.7 122.3  
Purchases of properties | ft³     41.4        
Sales of properties | ft³           (2.1)  
Production | ft³     (97.2)   (82.6) (76.4)  
Proved developed and undeveloped reserves, Ending Balance | ft³     1,366.4 [7]   1,212.4 1,118.9  
Proved developed reserves | ft³ 595.0 [8] 595.0 [8] 595.0 [8] 595.0 [8] 547.0 498.9 453.5
Proved undeveloped reserves | ft³ 771.4 [9] 771.4 [9] 771.4 [9] 771.4 [9] 665.5 620.0 456.1
Malaysia [Member] | Crude Oil [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       51.9 65.7 74.6  
Revisions of previous estimates       7.7 (3.6) 2.6  
Improved recovery       0.8 2.0    
Extensions and discoveries           2.4  
Purchases of properties       1.3      
Production       (10.7) (12.2) (13.9)  
Proved developed and undeveloped reserves, Ending Balance       51.0 [1] 51.9 65.7  
Proved developed reserves 37.0 [2] 37.0 [2] 37.0 [2] 37.0 [2] 37.3 51.8 62.1
Proved undeveloped reserves 14.0 [3] 14.0 [3] 14.0 [3] 14.0 [3] 14.6 13.9 12.5
Malaysia [Member] | Crude Oil And Condensate [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped reserves, Ending Balance       51.7      
Malaysia [Member] | Natural Gas Liquids [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance       0.3 0.5 0.6  
Revisions of previous estimates       0.7 (0.1) 0.2  
Production       (0.3) (0.1) (0.3)  
Proved developed and undeveloped reserves, Ending Balance       0.7 [4] 0.3 0.5  
Proved developed reserves 0.7 [5] 0.7 [5] 0.7 [5] 0.7 [5] 0.3 0.5 0.6
Malaysia [Member] | Natural Gas [Member]              
Proved developed and undeveloped oil reserves:              
Proved developed and undeveloped crude oil/synthetic oil reserves, Beginning Balance | ft³     491.4   539.7 546.8  
Revisions of previous estimates | ft³     11.8   (8.8) (2.1)  
Improved recovery | ft³     0.6     37.6  
Extensions and discoveries | ft³     4.6   1.7    
Production | ft³     (40.2)   (41.2) (42.6)  
Proved developed and undeveloped reserves, Ending Balance 468,200   468.2 [7]   491.4 539.7  
Proved developed reserves | ft³ 128.3 [8] 128.3 [8] 128.3 [8] 128.3 [8] 144.6 180.5 181.7
Proved undeveloped reserves | ft³ 339.9 [9] 339.9 [9] 339.9 [9] 339.9 [9] 346.7 359.2 365.1
[1] Includes total proved reserves of 25.5 MMBO for Total and United States attributable to the noncontrolling interest in MP GOM.
[2] Includes proved developed reserves of 19.1 MMBO for Total and United States attributable to the noncontrolling interest in MP GOM.
[3] Includes proved undeveloped reserves of 6.4 MMBO for Total and United States attributable to the noncontrolling interest in MP GOM.
[4] Includes total proved reserves of 1.1 MMBBL for Total and United States attributable to the noncontrolling interest in MP GOM.
[5] Includes proved developed reserves of 0.8 MMBBL for Total and United States attributable to the noncontrolling interest in MP GOM.
[6] Includes proved undeveloped reserves of 0.3 MMBBL for Total and United States attributable to the noncontrolling interest in MP GOM.
[7] Includes total proved reserves of 10.8 BCF for Total and United States attributable to the noncontrolling interest in MP GOM.
[8] Includes proved developed reserves of 8.2 BCF for Total and United States attributable to the noncontrolling interest in MP GOM.
[9] Includes proved undeveloped reserves of 2.6 BCF for Total and United States attributable to the noncontrolling interest in MP GOM.
[10] All synthetic oil operations were sold in June 2016.