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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 | Treasury Stock, at cost | Accumulated Other Comprehensive Income (Loss), net of tax
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  |  | $ 0 |  | $ 0
Adjusted balance beginning of period |  |  |  |  | 13,114 |  | (337)
Beginning balance at Dec. 31, 2016 |  | $ 0 |  | $ 5,247 | 13,114 | $ (1,125) | (337)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  |  | (76) |  |  |
Stock-based compensation plans expense |  |  |  | 104 |  |  |
Issuance of shares for warrant exercise |  |  |  | (67) |  |  |
Treasury stock retired |  |  |  | 829 |  | 829 |
Net income (loss) | $ (3,131) |  |  |  | (3,131) |  |
Dividends declared on preferred stock | 0 |  |  |  | 0 |  |
Dividends declared on common stock |  |  |  |  | (341) |  |
Treasury stock acquired |  |  |  |  |  | (1,028) |
Issuance of shares under incentive and stock compensation plans |  |  |  |  |  | 100 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  | (37) |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  | 67 |
Total other comprehensive income (loss) |  |  |  |  |  |  | 1,000
Ending balance at Dec. 31, 2017 | $ 13,494 | $ 0 | $ 4 | 4,379 | 9,642 | (1,194) | 663
Preferred Shares Outstanding, beginning of period at Dec. 31, 2016 |  | 0 |  |  |  |  |
Preferred Shares Outstanding |  |  |  |  |  |  |
Issuance of preferred shares |  | 0 |  |  |  |  |
Preferred Shares Outstanding, end of period at Dec. 31, 2017 |  | 0 |  |  |  |  |
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2016 |  |  | 373,949 |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |
Treasury stock acquired |  |  | (20,218) |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | 2,301 |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  |  | (747) |  |  |  |
Issuance of shares for warrant exercise |  |  | 1,550 |  |  |  |
Common Shares Outstanding, end of period at Dec. 31, 2017 |  |  | 356,835 |  |  |  |
Common Shares Outstanding |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.94 |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 0 |  |  |  |  |  |
Issuance of preferred stock |  | $ 0 |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  |  | 5 |  | (5)
Adjusted balance beginning of period |  |  |  |  | 9,647 |  | 658
Issuance of shares under incentive and stock compensation plans |  |  |  | (110) |  |  |
Stock-based compensation plans expense |  |  |  | 123 |  |  |
Issuance of shares for warrant exercise |  |  |  | (14) |  |  |
Treasury stock retired |  |  |  | 0 |  | 0 |
Net income (loss) | $ 1,807 |  |  |  | 1,807 |  |
Dividends declared on preferred stock | (6) |  |  |  | (6) |  |
Dividends declared on common stock |  |  |  |  | (393) |  |
Treasury stock acquired |  |  |  |  |  | 0 |
Issuance of shares under incentive and stock compensation plans |  |  |  |  |  | 132 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  | (43) |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  | 14 |
Total other comprehensive income (loss) |  |  |  |  |  |  | (2,237)
Ending balance at Dec. 31, 2018 | $ 13,101 | $ 334 | $ 4 | 4,378 | 11,055 | (1,091) | (1,579)
Preferred Shares Outstanding |  |  |  |  |  |  |
Issuance of preferred shares |  | 13,800 |  |  |  |  |
Preferred Shares Outstanding, end of period at Dec. 31, 2018 |  | 13,800 |  |  |  |  |
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 | $ 0 |  |  |  |  |  |
Issuance of preferred stock |  | $ 334 |  |  |  |  |
Adjusted balance beginning of period |  |  |  |  | 11,055 |  | (1,579)
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 |  |  |  | 0 |  | 0 |
Net income (loss) | $ 2,085 |  |  |  | 2,085 |  |
Dividends declared on preferred stock | (21) |  |  |  | (21) |  |
Dividends declared on common stock |  |  |  |  | (434) |  |
Treasury stock acquired |  |  |  |  |  | (200) |
Issuance of shares under incentive and stock compensation plans |  |  |  |  |  | 135 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  |  | (41) |
Stock Issued During Period, Value, Treasury Stock Reissued |  |  |  |  |  | 80 |
Total other comprehensive income (loss) |  |  |  |  |  |  | 1,631
Ending balance at Dec. 31, 2019 | $ 16,270 | $ 334 | $ 4 | $ 4,312 | 12,685 | $ (1,117) | 52
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 |  |  | (3,412) |  |  |  |
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 | $ 1,125.00 |  |  |  |  |  |
Issuance of preferred stock |  | $ 0 |  |  |  |  |
Cumulative effect of accounting changes, net of tax |  |  |  |  | $ 0 |  | $ 0

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