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Condensed Statements of Consolidated Changes in Equity (Unaudited) - USD ($) $ in Millions | Total | Cumulative Preferred Stock | Common Stock | Additional Paid-in-Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Series A Preferred Stock | Series A Preferred Stock Cumulative Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2021 |  | 1,000,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Redemption of Series A Preferred Stock (in shares) |  |  |  |  |  |  |  | 0
Redemption of Series A Preferred Stock |  |  |  |  |  |  |  | $ 0
Balance, beginning of period at Dec. 31, 2021 |  | $ 790 | $ 6 | $ 8,529 | $ 154 | $ (64) |  |
Balance, beginning of period (in shares) at Dec. 31, 2021 |  |  | 629,000,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuances related to benefit and investment plans (in shares) |  |  | 0 |  |  |  |  |
Issuances related to benefit and investment plans |  |  | $ 0 | 28 |  |  |  |
Net income | $ 923 |  |  |  | 923 |  |  |
Common Stock dividends declared (see Note 18) |  |  |  |  | (334) |  |  |
Preferred Stock dividends declared (see Note 18) |  |  |  |  | (24) |  |  |
Other comprehensive loss |  |  |  |  |  | (19) |  |
Balance, end of period (in shares) at Sep. 30, 2022 |  | 1,000,000 |  |  |  |  |  |
Balance, end of period at Sep. 30, 2022 | 9,989 | $ 790 | $ 6 | 8,557 | 719 | (83) |  |
Balance, end of period (in shares) at Sep. 30, 2022 |  |  | 629,000,000 |  |  |  |  |
Balance, beginning of period (in shares) at Jun. 30, 2022 |  | 1,000,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Redemption of Series A Preferred Stock (in shares) |  |  |  |  |  |  |  | 0
Redemption of Series A Preferred Stock |  |  |  |  |  |  |  | $ 0
Balance, beginning of period at Jun. 30, 2022 |  | $ 790 | $ 6 | 8,544 | 768 | (85) |  |
Balance, beginning of period (in shares) at Jun. 30, 2022 |  |  | 629,000,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuances related to benefit and investment plans (in shares) |  |  | 0 |  |  |  |  |
Issuances related to benefit and investment plans |  |  | $ 0 | 13 |  |  |  |
Net income | 202 |  |  |  | 202 |  |  |
Common Stock dividends declared (see Note 18) |  |  |  |  | (227) |  |  |
Preferred Stock dividends declared (see Note 18) |  |  |  |  | (24) |  |  |
Other comprehensive loss |  |  |  |  |  | 2 |  |
Balance, end of period (in shares) at Sep. 30, 2022 |  | 1,000,000 |  |  |  |  |  |
Balance, end of period at Sep. 30, 2022 | $ 9,989 | $ 790 | $ 6 | 8,557 | 719 | (83) |  |
Balance, end of period (in shares) at Sep. 30, 2022 |  |  | 629,000,000 |  |  |  |  |
Balance, beginning of period (in shares) at Dec. 31, 2022 | 800,000 | 1,000,000 |  |  |  |  | 800,000 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Redemption of Series A Preferred Stock (in shares) |  |  |  |  |  |  |  | (1,000,000)
Redemption of Series A Preferred Stock |  |  |  |  |  |  |  | $ (790)
Balance, beginning of period at Dec. 31, 2022 | $ 10,042 | $ 790 | $ 6 | 8,568 | 709 | (31) |  |
Balance, beginning of period (in shares) at Dec. 31, 2022 | 629,535,631 |  | 630,000,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuances related to benefit and investment plans (in shares) |  |  | 1,000,000 |  |  |  |  |
Issuances related to benefit and investment plans |  |  | $ 0 | 13 |  |  |  |
Net income | $ 725 |  |  |  | 725 |  |  |
Common Stock dividends declared (see Note 18) |  |  |  |  | (366) |  |  |
Preferred Stock dividends declared (see Note 18) |  |  |  |  | (41) |  |  |
Other comprehensive loss |  |  |  |  |  | 2 |  |
Balance, end of period (in shares) at Sep. 30, 2023 | 0 | 0 |  |  |  |  | 0 |
Balance, end of period at Sep. 30, 2023 | $ 9,585 | $ 0 | $ 6 | 8,581 | 1,027 | (29) |  |
Balance, end of period (in shares) at Sep. 30, 2023 | 631,209,962 |  | 631,000,000 |  |  |  |  |
Balance, beginning of period (in shares) at Jun. 30, 2023 |  | 1,000,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Redemption of Series A Preferred Stock (in shares) |  |  |  |  |  |  |  | (1,000,000)
Redemption of Series A Preferred Stock |  |  |  |  |  |  |  | $ (790)
Balance, beginning of period at Jun. 30, 2023 |  | $ 790 | $ 6 | 8,570 | 1,032 | (32) |  |
Balance, beginning of period (in shares) at Jun. 30, 2023 |  |  | 631,000,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Issuances related to benefit and investment plans (in shares) |  |  | 0 |  |  |  |  |
Issuances related to benefit and investment plans |  |  | $ 0 | 11 |  |  |  |
Net income | $ 282 |  |  |  | 282 |  |  |
Common Stock dividends declared (see Note 18) |  |  |  |  | (246) |  |  |
Preferred Stock dividends declared (see Note 18) |  |  |  |  | (41) |  |  |
Other comprehensive loss |  |  |  |  |  | 3 |  |
Balance, end of period (in shares) at Sep. 30, 2023 | 0 | 0 |  |  |  |  | 0 |
Balance, end of period at Sep. 30, 2023 | $ 9,585 | $ 0 | $ 6 | $ 8,581 | $ 1,027 | $ (29) |  |
Balance, end of period (in shares) at Sep. 30, 2023 | 631,209,962 |  | 631,000,000 |  |  |  |  |

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