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Consolidated Statement of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ 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 | Accumulated Other Comprehensive Income (Loss), net of tax Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss), net of tax Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  | $ 0 |  | $ 4,379 | $ 9,642 | $ 5 | $ 9,647 | $ (1,194) |  |  | $ 663 | $ (5) | $ 658
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (110) |  |  |  |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 123 |  |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  |  | (14) |  |  |  |  |  |  |  |  |
Net income | $ 1,807 |  |  |  | 1,807 |  |  |  |  |  |  |  |
Dividends declared on preferred stock | (6) |  |  |  | (6) |  |  |  |  |  |  |  |
Dividends declared on common stock |  |  |  |  | (393) |  |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  |  |  |  | 0 |  |  |  |  |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  |  |  |  | $ 132 | $ 14 |  |  |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  |  |  | (43) |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  | (2,237) |  |
Ending balance at Dec. 31, 2018 | $ 13,101 | $ 334 | $ 4 | 4,378 | 11,055 | 0 | 11,055 | (1,091) |  |  | (1,579) | 0 |
Preferred Shares Outstanding, beginning of period at Dec. 31, 2017 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares |  | 13,800 |  |  |  |  |  |  |  |  |  |  |
Preferred Shares Outstanding, end of period at Dec. 31, 2018 |  | 13,800 |  |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2017 |  |  | 356,835 |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  |  | 0 |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,856 |  |  |  |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (849) |  |  |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  | 309 |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding, end of period at Dec. 31, 2018 |  |  | 359,151 |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 1.10 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 412.50 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock |  | $ 334 |  |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (100) |  |  |  |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 114 |  |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  |  | (80) |  |  |  |  |  |  |  |  |
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 |  | (1,579)
Ending balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 |  |  |  |  |  | $ (18) |  |  |  |  |  |  |
Preferred Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred Shares Outstanding, end of period at Dec. 31, 2019 |  | 13,800 |  |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (3,400) |  | (3,412) |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,906 |  |  |  |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (796) |  |  |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  | 1,721 |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding, end of period at Dec. 31, 2019 |  |  | 359,570 |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 1.20 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,500.00 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (96) |  |  |  |  |  |  |  |  |
Stock-based compensation plans expense |  |  |  | 106 |  |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  |  | 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 |  |  | $ (1,192) |  |  | $ 1,170 | $ 0 | $ 52
Preferred Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred Shares Outstanding, end of period at Dec. 31, 2020 |  | 13,800 |  |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (2,700) |  | (2,661) |  |  |  |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,298 |  |  |  |  |  |  |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (718) |  |  |  |  |  |  |  |  |  |
Issuance of shares for warrant exercise |  |  | 0 |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding, end of period at Dec. 31, 2020 |  |  | 358,489 |  |  |  |  |  |  |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 1.30 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,500.00 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock |  | $ 0 |  |  |  |  |  |  |  |  |  |  |

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