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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, 2022 |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Beginning balance, common shares (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  | 933,325,000 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2022 | $ 13,454 |  |  |  |  |  | $ 2,500 | $ 1,257 | $ 6,286 | $ 15,616 |  |  |  |  |  | $ (5,910) | $ (6,295)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 967 |  |  |  |  |  |  |  |  | 967 |  |  |  |  |  |  |
Other comprehensive income (loss) | 1,066 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,066
Deferred compensation | (5) |  |  |  |  |  |  |  | (5) |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares | (768) |  |  |  |  |  |  |  |  | (768) |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  | $ (26) | $ (31) | $ (24) | $ (25) | $ (37) |  |  |  |  | $ (26) | $ (31) | $ (24) | $ (25) | $ (37) |  |
Open market Common Share repurchases (in shares) |  |  |  |  |  |  |  | (2,550,000) |  |  |  |  |  |  |  |  |
Open market Common Share repurchases | (38) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (38) |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  |  | (1,833,000) |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases | (34) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34) |
Common shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  |  | 7,622,000 |  |  |  |  |  |  |  |  |
Common shares reissued (returned) for stock options and other employee benefit plans | 138 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138 |
Ending balance, preferred shares (in shares) at Dec. 31, 2023 |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Ending balance, common shares (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  | 936,564,000 |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2023 | 14,637 |  |  |  |  |  | $ 2,500 | $ 1,257 | 6,281 | 15,672 |  |  |  |  |  | (5,844) | (5,229)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (161) |  |  |  |  |  |  |  |  | (161) |  |  |  |  |  |  |
Other comprehensive income (loss) | 1,759 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,759
Deferred compensation | (3) |  |  |  |  |  |  |  | (3) |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares | (784) |  |  |  |  |  |  |  |  | (784) |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  | (26) | (31) | (24) | (25) | (37) |  |  |  |  | (26) | (31) | (24) | (25) | (37) |  |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  |  | (1,991,000) |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases | (28) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (28) |
Common shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  |  | 9,342,000 |  |  |  |  |  |  |  |  |
Common shares reissued (returned) for stock options and other employee benefit plans | 128 |  |  |  |  |  |  |  | (42) |  |  |  |  |  |  | 170 |
Common Shares reissued under Scotiabank investment agreement, net of issuance costs (in shares) |  |  |  |  |  |  |  | 162,871,000 |  |  |  |  |  |  |  |  |
Common Shares reissued under Scotiabank investment agreement, net of issuance costs | 2,771 |  |  |  |  |  |  |  | (198) |  |  |  |  |  |  | 2,969 |
Ending balance, preferred shares (in shares) at Dec. 31, 2024 |  |  |  |  |  |  | 1,996,000 |  |  |  |  |  |  |  |  |  |
Ending balance, common shares (in shares) at Dec. 31, 2024 |  |  |  |  |  |  |  | 1,106,786,000 |  |  |  |  |  |  |  |  |
Ending 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) | 1,829 |  |  |  |  |  |  |  |  | 1,829 |  |  |  |  |  |  |
Other comprehensive income (loss) | 1,510 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,510
Deferred compensation | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Cash dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared on common shares | (911) |  |  |  |  |  |  |  |  | (911) |  |  |  |  |  |  |
Cash dividends declared on preferred stock |  | $ (26) | $ (31) | $ (24) | $ (25) | $ (37) |  |  |  |  | $ (26) | $ (31) | $ (24) | $ (25) | $ (37) |  |
Open market Common Share repurchases (in shares) |  |  |  |  |  |  |  | (11,109,000) |  |  |  |  |  |  |  |  |
Open market Common Share repurchases | (200) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200) |
Employee equity compensation program Common Share repurchases (in shares) |  |  |  |  |  |  |  | (1,963,000) |  |  |  |  |  |  |  |  |
Employee equity compensation program Common Share repurchases | (35) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35) |
Common shares reissued (returned) for stock options and other employee benefit plans (in shares) |  |  |  |  |  |  |  | 8,687,000 |  |  |  |  |  |  |  |  |
Common shares reissued (returned) for stock options and other employee benefit plans | 154 |  |  |  |  |  |  |  | (4) |  |  |  |  |  |  | 158 |
Ending balance, preferred shares (in shares) at Dec. 31, 2025 |  | 21,000 | 500,000 | 425,000 | 450,000 | 600,000 | 1,996,000 |  |  |  |  |  |  |  |  |  |
Ending balance, common shares (in shares) at Dec. 31, 2025 |  |  |  |  |  |  |  | 1,102,401,000 |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2025 | $ 20,381 |  |  |  |  |  | $ 2,500 | $ 1,257 | $ 6,035 | $ 15,359 |  |  |  |  |  | $ (2,810) | $ (1,960)

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
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