CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
OPERATING ACTIVITIES
Net income	$ 482	$ 503
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	317	328
Deferred income taxes	(7)	(11)
Provision for uncollectible accounts	7	13
Accrued interest on affiliate note	28	31
Net loss on early retirement of debt	8	12
Changes in current assets and liabilities:
Accounts receivable	17	36
Accounts payable	(7)	(20)
Accrued income and other taxes	30	67
Other current assets and liabilities, net	(64)	(154)
Other current assets and liabilities - affiliates, net	0	(16)
Changes in other noncurrent assets and liabilities, net	(14)	10
Changes in affiliate obligations, net	5	(18)
Other, net	12	4
Net cash provided by operating activities	814	785
INVESTING ACTIVITIES
Capital expenditures	(219)	(317)
Changes in advances to affiliates	0	1,147
Proceeds from sale of property, plant and equipment and other assets	8	0
Net cash (used in) provided by investing activities	(211)	830
FINANCING ACTIVITIES
Payments of long-term debt	(235)	(1,109)
Dividends paid	(300)	(500)
Changes in advances from affiliates	(72)	0
Net cash used in financing activities	(607)	(1,609)
Net (decrease) increase in cash, cash equivalents and restricted cash	(4)	6
Cash, cash equivalents and restricted cash at beginning of period	15	4
Cash, cash equivalents and restricted cash at end of period	11	10
Supplemental cash flow information:
Income taxes paid, net	(172)	(179)
Interest paid (net of capitalized interest of $5 and $10)	(37)	(81)
Cash, cash equivalents and restricted cash:
Total	$ 11	$ 10