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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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