CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income	$ 121	$ 197	$ 419	$ 486
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	431	429	1,304	1,250
Deferred income taxes			122	124
Changes in current assets and liabilities:
Accounts receivable			(41)	(101)
Accounts payable			(34)	(139)
Other assets and liabilities, net			(74)	(195)
Other assets and liabilities, affiliate			(780)	364
Changes in other noncurrent assets and liabilities, net			33	116
Other, net			(8)	39
Net cash provided by operating activities			941	1,944
INVESTING ACTIVITIES
Capital expenditures			(874)	(1,124)
Collections on note receivable - affiliate			0	122
Proceeds from sale of property, plant and equipment and other assets			52	105
Net cash used in investing activities			(822)	(897)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt			891	2,020
Distributions			(25)	(1,075)
Payments of long-term debt			(932)	(2,056)
Other			(1)	(4)
Net cash used in financing activities			(67)	(1,115)
Net increase (decrease) in cash, cash equivalents and restricted cash			52	(68)
Cash, cash equivalents and restricted cash at beginning of period			205	338
Cash, cash equivalents and restricted cash at end of period	257	270	257	270
Supplemental cash flow information:
Income taxes paid, net			(23)	(20)
Interest paid (net of capitalized interest of $11 and $18)			(304)	(323)
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	215	256	215	256
Cash and cash equivalents included in assets held for sale	36	0	36	0
Restricted cash included in Other current assets	2	2	2	2
Restricted cash included in Other, net noncurrent assets	4	12	4	12
Total	$ 257	$ 270	$ 257	$ 270