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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY - USD ($) shares in Millions, $ in Millions | Total | COMMON SHARES | ADDITIONAL PAID-IN CAPITAL: | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF DEFERRED INCOME TAXES: | RETAINED EARNINGS: | TREASURY SHARES AT COST:
--- | --- | --- | --- | --- | --- | ---
Balance beginning of period (in shares) at Dec. 31, 2022 |  | 39.2 |  |  |  |
Balance beginning of period at Dec. 31, 2022 |  | $ 1 | $ 2,302 | $ (1,996) | $ 12,042 | $ (3,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issued (redeemed) during the period, net (in shares) |  | 4.2 |  |  |  |
Public offering of shares |  |  | 1,445 |  |  |
Share-based compensation plans |  |  | 5 |  |  |
Net increase (decrease) during the period | $ 113 |  |  | 113 |  |
Net income (loss) | 1,035 |  |  |  | 1,035 |
Dividends declared ($2.00 per share in 2Q 2024 and $3.75 per share YTD in 2024;$1.65 per share in 2Q 2023 and $3.30 per share YTD in 2023) |  |  |  |  | (136) |
Balance end of period (in shares) at Jun. 30, 2023 |  | 43.4 |  |  |  |
Balance end of period at Jun. 30, 2023 | 10,902 | $ 1 | 3,753 | (1,883) | 12,940 | (3,908)
Balance beginning of period (in shares) at Mar. 31, 2023 |  | 39.3 |  |  |  |
Balance beginning of period at Mar. 31, 2023 |  | $ 1 | 2,295 | (1,716) | 12,342 | (3,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issued (redeemed) during the period, net (in shares) |  | 4.1 |  |  |  |
Public offering of shares |  |  | 1,445 |  |  |
Share-based compensation plans |  |  | 12 |  |  |
Net increase (decrease) during the period | (168) |  |  | (168) |  |
Net income (loss) | 670 |  |  |  | 670 |
Dividends declared ($2.00 per share in 2Q 2024 and $3.75 per share YTD in 2024;$1.65 per share in 2Q 2023 and $3.30 per share YTD in 2023) |  |  |  |  | (72) |
Balance end of period (in shares) at Jun. 30, 2023 |  | 43.4 |  |  |  |
Balance end of period at Jun. 30, 2023 | $ 10,902 | $ 1 | 3,753 | (1,883) | 12,940 | (3,908)
Balance beginning of period (in shares) at Dec. 31, 2023 | 74.2 | 43.4 |  |  |  |
Balance beginning of period at Dec. 31, 2023 | $ 13,202 | $ 1 | 3,773 | (934) | 14,270 | (3,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issued (redeemed) during the period, net (in shares) |  | 0.2 |  |  |  |
Treasury shares acquired (in shares) |  | (0.3) |  |  |  |
Share-based compensation plans |  |  | 12 |  |  |
Net increase (decrease) during the period | (227) |  |  | (227) |  |
Net income (loss) | $ 1,457 |  |  |  | 1,457 |
Dividends declared ($2.00 per share in 2Q 2024 and $3.75 per share YTD in 2024;$1.65 per share in 2Q 2023 and $3.30 per share YTD in 2023) |  |  |  |  | (163) |
Purchase of treasury shares |  |  |  |  |  | (100)
Balance end of period (in shares) at Jun. 30, 2024 | 74.3 | 43.3 |  |  |  |
Balance end of period at Jun. 30, 2024 | $ 14,182 | $ 1 | 3,785 | (1,160) | 15,565 | (4,008)
Balance beginning of period (in shares) at Mar. 31, 2024 |  | 43.5 |  |  |  |
Balance beginning of period at Mar. 31, 2024 |  | $ 1 | 3,768 | (1,125) | 14,927 | (3,943)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Treasury shares acquired (in shares) |  | (0.2) |  |  |  |
Share-based compensation plans |  |  | 17 |  |  |
Net increase (decrease) during the period | (36) |  |  | (36) |  |
Net income (loss) | $ 724 |  |  |  | 724 |
Dividends declared ($2.00 per share in 2Q 2024 and $3.75 per share YTD in 2024;$1.65 per share in 2Q 2023 and $3.30 per share YTD in 2023) |  |  |  |  | (86) |
Purchase of treasury shares |  |  |  |  |  | (65)
Balance end of period (in shares) at Jun. 30, 2024 | 74.3 | 43.3 |  |  |  |
Balance end of period at Jun. 30, 2024 | $ 14,182 | $ 1 | $ 3,785 | $ (1,160) | $ 15,565 | $ (4,008)

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