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Sales and Other Operating Revenue - Revenue from Contracts With Customers (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue from contracts with customers | [1] | $ 32,567,000,000 | $ 36,417,000,000 | $ 29,106,000,000
Revenue, Performance Obligation, Description of Payment Terms |  | Payment is typically due within 30 days or less. |  |
Physical gas contracts [Member] |  |  |  |
Revenue from contracts with customers |  | $ 6,558,000,000 | 8,218,000,000 | 8,669,000,000
Crude oil product line [Member] |  |  |  |
Revenue from contracts with customers |  | 804,000,000 | 1,112,000,000 | 588,000,000
Natural Gas Product Line [Member] |  |  |  |
Revenue from contracts with customers |  | 5,313,000,000 | 6,734,000,000 | 7,811,000,000
Other Products [Member] |  |  |  |
Revenue from contracts with customers |  | 441,000,000 | 372,000,000 | 270,000,000
Financial Derivative Contracts [Member] |  |  |  |
Revenue from contracts with customers |  | (97,000,000) | 101,000,000 | (88,000,000)
Lower 48 Segment [Member] |  |  |  |
Revenue from contracts with customers |  | 15,514,000,000 | 17,029,000,000 | 12,968,000,000
Lower 48 Segment [Member] | Physical gas contracts [Member] |  |  |  |
Revenue from contracts with customers |  | 4,989,000,000 | 6,358,000,000 | 6,302,000,000
Canada Segment [Member] |  |  |  |
Revenue from contracts with customers |  | 2,910,000,000 | 3,184,000,000 | 3,178,000,000
Canada Segment [Member] | Physical gas contracts [Member] |  |  |  |
Revenue from contracts with customers |  | 691,000,000 | 629,000,000 | 864,000,000
Europe, Middle East and North Africa Segment [Member] | Physical gas contracts [Member] |  |  |  |
Revenue from contracts with customers |  | 878,000,000 | 1,231,000,000 | 1,503,000,000
Accounting Standards Update 2014-09 [Member] |  |  |  |
Revenue from contracts with customers |  | $ 26,106,000,000 | $ 28,098,000,000 | $ 20,525,000,000
[1] | Sales and other operating revenues are attributable to countries based on the location of the selling operation.

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