Schedule of Consolidated VIEs, Carrying Amounts of Assets and Liabilities - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Cash and cash equivalents (variable interest entities restricted - 2020: $53; 2019: $37)	$ 4,549	$ 2,367
Other current assets	559	679
Net property (variable interest entities restricted - 2020: $230; 2019: $330)	20,413	20,996
Deferred charges and other assets	1,162	818
Total Assets	59,945	60,524
Accrued and other current liabilities	3,408	2,762
Long-Term Debt (variable interest entities nonrecourse - 2020: $19; 2019: $34)	16,698	15,975
Other noncurrent obligations	7,497	6,547
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents (variable interest entities restricted - 2020: $53; 2019: $37)	53	37
Other current assets	42	51
Net property (variable interest entities restricted - 2020: $230; 2019: $330)	230	330
Deferred charges and other assets	16	18
Total Assets	341	436
Accrued and other current liabilities	68	141
Long-Term Debt (variable interest entities nonrecourse - 2020: $19; 2019: $34)	19	34
Other noncurrent obligations	19	21
Total Liabilities	$ 106	$ 196