Cash And Cash Equivalents Net Change in Operating Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended			12 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019		Dec. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Accounts receivable		$ 2,084	$ (340)
Accounts receivable from related companies		118	7
Inventories		(180)	28
Other current assets		150	37
Other non-current assets, net		(159)	(43)
Accounts payable		(2,108)	201
Accounts payable to related companies		12	(109)
Accrued and other current liabilities		(122)	(21)
Other non-current liabilities		42	(87)
Derivative assets and liabilities, net		190	140
Net change in operating assets and liabilities, net of effects of acquisitions	$ 150	$ 27	$ (187)	[1]	$ (405)	$ 62

[1] *As adjusted. See Note 1.