Schedule I - Condensed Financial Information Of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Net cash flows provided by operating activities	$ 2,263	$ 1,661	$ 1,727
Cash Flows From Investing Activities:
Other	23	8	11
Net cash flows provided by (used in) investing activities	(3,370)	(3,528)	(3,329)
Cash flows from financing activities:
Dividends on common stock	(610)	(565)	(494)
Short-term debt, net	522	55	50
Maturities of long-term debt	(505)	(8)	(442)
Issuances of long-term debt	1,467	1,997	2,183
Issuances of common stock	333	308	476
Employee payroll taxes related to stock-based compensation	(16)	(17)	(20)
Debt issuance costs	(18)	(18)	(20)
Net cash flows provided by (used in) financing activities	1,168	1,721	1,727
Cash, cash equivalents, and restricted cash at beginning of year	155	301	176
Cash, cash equivalents, and restricted cash at end of year	216	155	301
Noncash Investing and Financing Items [Abstract]
Stock Issued		33
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash flows provided by operating activities	44	79	147
Cash Flows From Investing Activities:
Money pool advances, net	40		86
Money pool advances, net		(92)
Notes receivable – ATXI	35	40	0
Investments in subsidiaries	(30)	(489)	(956)
Other	3	7	8
Net cash flows provided by (used in) investing activities	48	(534)	(862)
Cash flows from financing activities:
Dividends on common stock	(610)	(565)	(494)
Short-term debt, net	198	(213)	337
Money pool borrowings, net	0	0	(24)
Maturities of long-term debt	0	0	(350)
Issuances of long-term debt	0	949	798
Issuances of common stock	333	308	476
Employee payroll taxes related to stock-based compensation	(16)	(17)	(20)
Debt issuance costs	(1)	(7)	(7)
Net cash flows provided by (used in) financing activities	(96)	455	716
Net change in cash, cash equivalents, and restricted cash	(4)	0	1
Cash, cash equivalents, and restricted cash at beginning of year	4	4	3
Cash, cash equivalents, and restricted cash at end of year	0	4	4
Cash dividends received from consolidated subsidiaries	76	123	105
Noncash Investing and Financing Items [Abstract]
Stock Issued	$ 31	$ 33	$ 38

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