Segment Disclosures and Related Information (Geographic Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue from contracts with customers	$ 45,828	$ 18,784	$ 32,567
Long-Lived Assets	71,612	47,603	50,722
U.S. [Member]
Segment Reporting Information [Line Items]
Revenue from contracts with customers	34,847	13,230	21,159
Long-Lived Assets	50,580	24,034	26,566
Australia [Member]
Segment Reporting Information [Line Items]
Revenue from contracts with customers		605	1,647
Long-Lived Assets	5,579	6,676	7,228
Canada [Member]
Segment Reporting Information [Line Items]
Revenue from contracts with customers	2,494	1,261	1,769
Long-Lived Assets	6,608	6,385	5,769
China
Segment Reporting Information [Line Items]
Revenue from contracts with customers	724	460	772
Long-Lived Assets	1,476	1,491	1,447
Indonesia
Segment Reporting Information [Line Items]
Revenue from contracts with customers	879	689	875
Long-Lived Assets	28	464	605
Libya [Member]
Segment Reporting Information [Line Items]
Revenue from contracts with customers	1,102	155	1,103
Long-Lived Assets	659	670	668
Malaysia
Segment Reporting Information [Line Items]
Revenue from contracts with customers	975	610	1,230
Long-Lived Assets	1,252	1,501	1,871
Norway
Segment Reporting Information [Line Items]
Revenue from contracts with customers	2,563	1,426	2,349
Long-Lived Assets	4,681	5,294	5,258
United Kingdom [Member]
Segment Reporting Information [Line Items]
Revenue from contracts with customers	2,236	336	1,649
Long-Lived Assets	1	1	2
Other foreign Countries
Segment Reporting Information [Line Items]
Revenue from contracts with customers	8	12	14
Long-Lived Assets	$ 748	$ 1,087	$ 1,308