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Supplemental Oil and Gas Disclosures (Unaudited) (Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oil and Gas Exploration and Production Industries Disclosures [Abstract]        
Future cash inflows $ 75,314 $ 17,997 $ 27,003  
Future production costs (23,235) (11,969) (14,981)  
Future development costs (6,032) (1,924) (3,246)  
Future income tax expense (8,135) 0 (476)  
Future net cash flows 37,912 4,104 8,300  
10% annual discount for estimated timing of cash flows (19,181) (2,257) (4,600)  
Standardized measure of discounted future net cash flows $ 18,731 $ 1,847 $ 3,700 $ 5,999