Schedule of Consolidated VIEs, Carrying Amounts of Assets and Liabilities - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Other current assets	$ 569	$ 658
Deferred charges and other assets	1,068	818
Total Assets	60,686	60,524
Accrued and other current liabilities	2,811	2,762
Other noncurrent obligations	6,937	6,547
Cash and cash equivalents (variable interest entities restricted - 2020: $44; 2019: $37)	3,633	2,367
Net property (variable interest entities restricted - 2020: $286; 2019: $330)	20,806	20,996
Long-term debt	16,313	15,975
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Other current assets	52	51
Deferred charges and other assets	16	18
Total Assets	398	436
Accrued and other current liabilities	115	141
Other noncurrent obligations	19	21
Total Liabilities	164	196
Cash and cash equivalents (variable interest entities restricted - 2020: $44; 2019: $37)	44	37
Net property (variable interest entities restricted - 2020: $286; 2019: $330)	286	330
Long-term debt	$ 30	$ 34