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STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY - USD ($) $ in Millions | Total | Series A Preferred Stock | Cumulative Preferred Stock | Cumulative Preferred Stock Series B and Series C Preferred Stock | Cumulative Preferred Stock Series A Preferred Stock | Common Stock | Additional Paid-in-Capital | Additional Paid-in-Capital Series B and Series C Preferred Stock | Retained Earnings (Accumulated Deficit) | Retained Earnings (Accumulated Deficit) Series A Preferred Stock | Retained Earnings (Accumulated Deficit) Series B Preferred Stock | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2020 |  |  | 3,000,000 |  |  |  |  |  |  |  |  |
Balance, beginning of year at Dec. 31, 2020 |  |  | $ 2,363 |  |  | $ 6 | $ 6,914 |  | $ (845) |  |  | $ (90)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Series B Preferred Stock and Series C Preferred Stock (in shares) |  |  |  | (2,000,000) |  |  |  |  |  |  |  |
Conversion of Series B Preferred Stock and Series C Preferred Stock |  |  |  | $ (1,573) |  |  |  | $ 1,573 |  |  |  |
Redemption of Series A Preferred Stock (in shares) |  |  |  |  | 0 |  |  |  |  |  |  |
Redemption of Series A Preferred Stock |  |  |  |  | $ 0 |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  | 77,000,000 |  |  |  |  |  |
Stock issued |  |  |  |  |  | $ 0 | 1 |  |  |  |  |
Balance, end of year (in shares) at Dec. 31, 2021 | 800,000 | 800,000 | 1,000,000 |  |  |  |  |  |  |  |  |
Balance, beginning of year (in shares) at Dec. 31, 2020 |  |  |  |  |  | 551,000,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Issuance related to benefit and investment plans (in shares) |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Issuances related to benefit and investment plans |  |  |  |  |  | $ 0 | 41 |  |  |  |  |
Net income (loss) | $ 1,486 |  |  |  |  |  |  |  | 1,486 |  |  |
Common Stock dividends declared (see Note 12) |  |  |  |  |  |  |  |  | (404) |  |  |
Preferred stock dividends declared |  |  |  |  |  |  |  |  |  | $ (49) | $ (34) |
Net current period other comprehensive income (loss) | 26 |  |  |  |  |  |  |  |  |  |  | 26
Balance, end of year (in shares) at Dec. 31, 2021 |  |  |  |  |  | 629,000,000 |  |  |  |  |  |
Balance, end of year at Dec. 31, 2021 | $ 9,415 |  | $ 790 |  |  | $ 6 | 8,529 |  | 154 |  |  | (64)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Series B Preferred Stock and Series C Preferred Stock (in shares) |  |  |  | 0 |  |  |  |  |  |  |  |
Conversion of Series B Preferred Stock and Series C Preferred Stock |  |  |  | $ 0 |  |  |  | 0 |  |  |  |
Redemption of Series A Preferred Stock (in shares) |  |  |  |  | 0 |  |  |  |  |  |  |
Redemption of Series A Preferred Stock |  |  |  |  | $ 0 |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |
Stock issued |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Balance, end of year (in shares) at Dec. 31, 2022 | 800,000 | 800,000 | 1,000,000 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Issuance related to benefit and investment plans (in shares) |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Issuances related to benefit and investment plans |  |  |  |  |  | $ 0 | 39 |  |  |  |  |
Net income (loss) | $ 1,057 |  |  |  |  |  |  |  | 1,057 |  |  |
Common Stock dividends declared (see Note 12) |  |  |  |  |  |  |  |  | (453) |  |  |
Preferred stock dividends declared |  |  |  |  |  |  |  |  |  | (49) | 0 |
Net current period other comprehensive income (loss) | $ 33 |  |  |  |  |  |  |  |  |  |  | 33
Balance, end of year (in shares) at Dec. 31, 2022 | 629,535,631 |  |  |  |  | 630,000,000 |  |  |  |  |  |
Balance, end of year at Dec. 31, 2022 | $ 10,042 |  | $ 790 |  |  | $ 6 | 8,568 |  | 709 |  |  | (31)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Series B Preferred Stock and Series C Preferred Stock (in shares) |  |  |  | 0 |  |  |  |  |  |  |  |
Conversion of Series B Preferred Stock and Series C Preferred Stock |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  |
Redemption of Series A Preferred Stock (in shares) |  |  |  |  | (1,000,000) |  |  |  |  |  |  |
Redemption of Series A Preferred Stock |  |  |  |  | $ (790) |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |
Stock issued |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Balance, end of year (in shares) at Dec. 31, 2023 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Issuance related to benefit and investment plans (in shares) |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Issuances related to benefit and investment plans |  |  |  |  |  | $ 0 | 36 |  |  |  |  |
Net income (loss) | $ 917 |  |  |  |  |  |  |  | 917 |  |  |
Common Stock dividends declared (see Note 12) |  |  |  |  |  |  |  |  | (492) |  |  |
Preferred stock dividends declared |  |  |  |  |  |  |  |  |  | $ (42) | $ 0 |
Net current period other comprehensive income (loss) | $ (4) |  |  |  |  |  |  |  |  |  |  | (4)
Balance, end of year (in shares) at Dec. 31, 2023 | 631,225,829 |  |  |  |  | 631,000,000 |  |  |  |  |  |
Balance, end of year at Dec. 31, 2023 | $ 9,667 |  | $ 0 |  |  | $ 6 | $ 8,604 |  | $ 1,092 |  |  | $ (35)

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