CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Total operating revenue	$ 6,951	$ 7,313	$ 8,052
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	1,722	1,995	2,333
Selling, general and administrative	354	564	659
Operating expenses - affiliates	758	728	812
Depreciation and amortization	1,009	1,315	1,364
Total operating expenses	3,843	4,602	5,168
OPERATING INCOME	3,108	2,711	2,884
OTHER (EXPENSE) INCOME
Interest expense	(181)	(279)	(380)
Interest expense - affiliates, net	(105)	(74)	(62)
Other (expense) income, net	(6)	(56)	26
Total other expense, net	(292)	(409)	(416)
INCOME BEFORE INCOME TAXES	2,816	2,302	2,468
Income tax expense	709	595	641
NET INCOME	2,107	1,707	1,827
Non-Affiliate Services
Revenue from Contract with Customer [Abstract]
Total operating revenue	4,562	4,826	5,179
Affiliate Services
Revenue from Contract with Customer [Abstract]
Total operating revenue	$ 2,389	$ 2,487	$ 2,873