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Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions | Total | Preferred Stock, end of period | Common Stock | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Treasury Stock, at cost | Treasury Stock, at cost Stock Compensation Plan | Warrant | Accumulated Other Comprehensive Income (Loss), net of tax
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 |  |  |  | $ 4,378 | $ 11,055 | $ 0 | $ 11,055 | $ (1,091) |  |  | $ (1,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (100) |  |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 114 |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  |  | (80) |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  |  |  | 0 |  |  |  | 0 |  |  |
Net income | $ 2,085 |  |  |  | 2,085 |  |  |  |  |  |
Dividends declared on preferred stock | (21) |  |  |  | (21) |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (434) |  |  |  |  |  |
Treasury stock acquired | (200) |  |  |  |  |  |  | (200) |  |  |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  |  |  |  | $ 135 | $ 80 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  |  |  | (41) |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  | 1,631
Ending balance at Dec. 31, 2019 | $ 16,270 | $ 334 | $ 4 | 4,312 | 12,685 |  | 12,667 | (1,117) |  |  | 52
Ending balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 |  |  |  |  |  | (18) |  |  |  |  |
Preferred Shares Outstanding, end of period at Dec. 31, 2019 |  | 13,800,000 |  |  |  |  |  |  |  |  |
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2018 |  |  | 359,151,000 |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (3,400,000) |  | (3,412,000) |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,906,000 |  |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (796,000) |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  | 1,721,000 |  |  |  |  |  |  |  |
Common Shares Outstanding, end of period at Dec. 31, 2019 |  |  | 359,570,000 |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 1.20 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,500 |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (96) |  |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 106 |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  |  | 0 |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  |  |  | 0 |  |  |  | 0 |  |  |
Net income | $ 1,737 |  |  |  | 1,737 |  |  |  |  |  |
Dividends declared on preferred stock | (21) |  |  |  | (21) |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (465) |  |  |  |  |  |
Treasury stock acquired | (150) |  |  |  |  |  |  | (150) |  |  |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  |  |  |  | 112 | 0 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  |  |  | (37) |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  | 1,118
Ending balance at Dec. 31, 2020 | $ 18,556 | $ 334 | $ 4 | 4,322 | 13,918 | $ 0 | $ 13,918 | (1,192) |  |  | 1,170
Preferred Shares Outstanding, end of period at Dec. 31, 2020 |  | 13,800,000 |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (2,700,000) |  | (2,661,000) |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,298,000 |  |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (718,000) |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  | 0 |  |  |  |  |  |  |  |
Common Shares Outstanding, end of period at Dec. 31, 2020 |  |  | 358,489,000 |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 1.30 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,500 |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (90) |  |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 116 |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  |  | 0 |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  |  |  | (1,039) |  |  |  | (1,039) |  |  |
Net income | $ 2,365 |  |  |  | 2,365 |  |  |  |  |  |
Dividends declared on preferred stock | (21) |  |  |  | (21) |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (498) |  |  |  |  |  |
Treasury stock acquired | (1,700) |  |  |  |  |  |  | (1,702) |  |  |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  |  |  |  | $ 146 | $ 0 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  |  |  | (31) |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  | (998)
Ending balance at Dec. 31, 2021 | $ 17,843 | $ 334 | $ 4 | $ 3,309 | $ 15,764 |  |  | $ (1,740) |  |  | $ 172
Preferred Shares Outstanding, end of period at Dec. 31, 2021 |  | 13,800,000 |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (25,900,000) |  | (25,878,000) |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,902,000 |  |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (587,000) |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  | 0 |  |  |  |  |  |  |  |
Common Shares Outstanding, end of period at Dec. 31, 2021 |  |  | 334,926,000 |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 1.44 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,500 |  |  |  |  |  |  |  |  |  |

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