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Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | Series D Preferred Stock | Series E Preferred Stock | Series F Preferred Stock | Series G Preferred Stock | Series H Preferred Stock | Preferred Stock | Common Shares | Capital Surplus | Retained Earnings | Retained Earnings Series D Preferred Stock | Retained Earnings Series E Preferred Stock | Retained Earnings Series F Preferred Stock | Retained Earnings Series G Preferred Stock | Retained Earnings Series H Preferred Stock | Treasury Stock, at Cost | Accumulated Other Comprehensive Income (Loss)
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Beginning balance, Preferred Shares (in shares) at Dec. 31, 2024 |  |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Beginning balance, Common Shares (in shares) at Dec. 31, 2024 |  |  |  |  |  |  |  |  | 1,106,786,000 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2024 |  | $ 18,176 |  |  |  |  |  | $ 2,500 | $ 1,257 | $ 6,038 | $ 14,584 |  |  |  |  |  | $ (2,733) | $ (3,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 830 |  |  |  |  |  |  |  |  | 830 |  |  |  |  |  |  |
Other comprehensive income (loss) |  | 969 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 969
Deferred compensation |  | (1) |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  | (456) |  |  |  |  |  |  |  |  | (456) |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  | $ (13) | $ (15) | $ (12) | $ (13) | $ (19) |  |  |  |  | $ (13) | $ (15) | $ (12) | $ (13) | $ (19) |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  |  |  | (1,961,000) |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  | (35) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35) |
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  |  |  | 7,628,000 |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans |  | 73 |  |  |  |  |  |  |  | (66) |  |  |  |  |  |  | 139 |
Ending balance, Preferred Shares (in shares) at Jun. 30, 2025 |  |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Ending balance, Common Shares (in shares) at Jun. 30, 2025 |  |  |  |  |  |  |  |  | 1,112,453,000 |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2025 |  | 19,484 |  |  |  |  |  | $ 2,500 | $ 1,257 | 5,971 | 14,886 |  |  |  |  |  | (2,629) | (2,501)
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock (in usd per share) |  |  | $ 25.00 | $ 0.766 | $ 0.706 | $ 0.703 | $ 0.775 |  |  |  |  |  |  |  |  |  |  |
Beginning balance, Preferred Shares (in shares) at Mar. 31, 2025 |  |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Beginning balance, Common Shares (in shares) at Mar. 31, 2025 |  |  |  |  |  |  |  |  | 1,111,986,000 |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2025 |  | 19,003 |  |  |  |  |  | $ 2,500 | $ 1,257 | 5,946 | 14,724 |  |  |  |  |  | (2,637) | (2,787)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 425 |  |  |  |  |  |  |  |  | 425 |  |  |  |  |  |  |
Other comprehensive income (loss) |  | 286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 286
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  | (227) |  |  |  |  |  |  |  |  | (227) |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  | $ (6) | $ (7) | $ (6) | $ (7) | $ (10) |  |  |  |  | (6) | (7) | (6) | (7) | (10) |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  |  |  | (3,000) |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  |  |  | 470,000 |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans |  | 33 |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  | 8 |
Ending balance, Preferred Shares (in shares) at Jun. 30, 2025 |  |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Ending balance, Common Shares (in shares) at Jun. 30, 2025 |  |  |  |  |  |  |  |  | 1,112,453,000 |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2025 |  | 19,484 |  |  |  |  |  | $ 2,500 | $ 1,257 | 5,971 | 14,886 |  |  |  |  |  | (2,629) | (2,501)
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock (in usd per share) |  |  | $ 12.50 | $ 0.382813 | $ 0.353125 | $ 0.351563 | $ 0.387500 |  |  |  |  |  |  |  |  |  |  |
Beginning balance, Preferred Shares (in shares) at Dec. 31, 2025 |  |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Beginning balance, Common Shares (in shares) at Dec. 31, 2025 |  |  |  |  |  |  |  |  | 1,102,401,000 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2025 |  | 20,381 |  |  |  |  |  | $ 2,500 | $ 1,257 | 6,035 | 15,359 |  |  |  |  |  | (2,810) | (1,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,031 |  |  |  |  |  |  |  |  | 1,031 |  |  |  |  |  |  |
Other comprehensive income (loss) |  | (394) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (394)
Deferred compensation |  | (1) |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  | (445) |  |  |  |  |  |  |  |  | (445) |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  | $ (13) | $ (15) | $ (12) | $ (13) | $ (19) |  |  |  |  | (13) | (15) | (12) | (13) | (19) |  |
Common Share repurchases (in shares) | [1] |  |  |  |  |  |  |  | (33,500,000) |  |  |  |  |  |  |  |  |
Common Share repurchases | [1] | (727) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (727) |
Excise tax on share repurchases |  | (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6) |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  |  |  | (2,170,000) |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  | (47) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (47) |
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  |  |  | 5,304,000 |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans |  | 78 |  |  |  |  |  |  |  | (20) |  |  |  |  |  |  | 98 |
Ending balance, Preferred Shares (in shares) at Jun. 30, 2026 |  |  | 21,000 | 500,000 | 425,000 | 450,000 | 600,000 | 1,996,000 |  |  |  |  |  |  |  |  |  |
Ending balance, Common Shares (in shares) at Jun. 30, 2026 |  |  |  |  |  |  |  |  | 1,072,035,000 |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2026 |  | 19,798 |  |  |  |  |  | $ 2,500 | $ 1,257 | 6,014 | 15,873 |  |  |  |  |  | (3,492) | (2,354)
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock (in usd per share) |  |  | $ 25.00 | $ 0.766 | $ 0.706 | $ 0.703 | $ 0.775 |  |  |  |  |  |  |  |  |  |  |
Beginning balance, Preferred Shares (in shares) at Mar. 31, 2026 |  |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Beginning balance, Common Shares (in shares) at Mar. 31, 2026 |  |  |  |  |  |  |  |  | 1,087,293,000 |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2026 |  | 19,987 |  |  |  |  |  | $ 2,500 | $ 1,257 | 5,981 | 15,622 |  |  |  |  |  | (3,152) | (2,221)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 509 |  |  |  |  |  |  |  |  | 509 |  |  |  |  |  |  |
Other comprehensive income (loss) |  | (133) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (133)
Deferred compensation |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares |  | $ (222) |  |  |  |  |  |  |  |  | (222) |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  |  | $ (7) | $ (6) | $ (6) | $ (6) | $ (11) |  |  |  |  | $ (7) | $ (6) | $ (6) | $ (6) | $ (11) |  |
Common Share repurchases (in shares) |  | (16,000,000) |  |  |  |  |  |  | (15,531,000) |  |  |  |  |  |  |  |  |
Common Share repurchases |  | $ (341) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (341) |
Excise tax on share repurchases |  | (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  |  |  | (6,000) |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  |  |  | 279,000 |  |  |  |  |  |  |  |  |
Common Shares reissued (returned) for stock options and other employee benefit plans |  | 37 |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  | 5 |
Ending balance, Preferred Shares (in shares) at Jun. 30, 2026 |  |  | 21,000 | 500,000 | 425,000 | 450,000 | 600,000 | 1,996,000 |  |  |  |  |  |  |  |  |  |
Ending balance, Common Shares (in shares) at Jun. 30, 2026 |  |  |  |  |  |  |  |  | 1,072,035,000 |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2026 |  | $ 19,798 |  |  |  |  |  | $ 2,500 | $ 1,257 | $ 6,014 | $ 15,873 |  |  |  |  |  | $ (3,492) | $ (2,354)
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on preferred stock (in usd per share) |  |  | $ 12.50 | $ 0.382813 | $ 0.353125 | $ 0.351563 | $ 0.387500 |  |  |  |  |  |  |  |  |  |  |
[1] | Includes open market repurchases and shares purchased pursuant to the share repurchase agreement with Scotiabank.

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