Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
RELATED PARTY ASSETS
Accounts receivable, net	$ 38	$ 48
Other current assets	0	2
Deferred charges and other assets	86	55
Total Assets	124	105
RELATED PARTY LIABILITIES [Abstract]
Current portion of debt	6	6
Accounts payable	23	26
Other current liabilities	3	7
Long-term debt	157	148
Other long-term liabilities and deferred credits	41	34
Total Liabilities	230	221
RELATED PARTY REVENUES [Abstract]
Revenues	13,209	14,144	$ 13,705
RELATED PARTY OPERATING COSTS, EXPENSES AND OTHER [Abstract]
Costs of sales	3,263	4,421	4,345
Other operating expenses	(3)	(3)	(1)
Affiliated Entity [Member]
RELATED PARTY REVENUES [Abstract]
Revenues	269	265	162
RELATED PARTY OPERATING COSTS, EXPENSES AND OTHER [Abstract]
Costs of sales	75	63	20
Other operating expenses	$ 132	$ 91	$ 100