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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Treasury Stock | AOCI Attributable to Parent [Member]
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of accounting change net of income taxes |  |  |  | $ 0 |  | $ 0
Adjusted balance, beginning of period |  |  |  | 13,114 |  | (337)
Beginning balance at Dec. 31, 2016 |  |  | $ 5,247 | 13,114 | $ (1,125) | (337)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | (65) |  |  |
Stock-based compensation plans expense |  |  | 56 |  |  |
Issuance of shares for warrant exercise |  |  | (43) |  | 43 |
Net income | $ 338 |  |  | 338 |  |
Dividends declared on common stock |  |  |  | (170) |  |
Treasury stock acquired |  |  |  |  | (650) |
Issuance of shares under incentive and stock compensation plans |  |  |  |  | 79 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  | 34 |
Total other comprehensive income (loss) |  |  |  |  |  | 831
Ending balance at Jun. 30, 2017 | 17,288 | $ 4 | 5,195 | 13,282 | (1,687) | 494
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2016 |  | 373,949 |  |  |  |
Stock Issued or Granted During Period, Share-based Compensation [Abstract] |  |  |  |  |  |
Treasury stock acquired |  | 13,299 |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 1,850 |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  | 686 |  |  |  |
Issuance of shares for warrant exercise |  | 1,006 |  |  |  |
Common Shares Outstanding, at end of period at Jun. 30, 2017 |  | 362,820 |  |  |  |
Beginning balance at Mar. 31, 2017 |  |  |  |  |  | (207)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | (40) |  |  |  |  |
Ending balance at Jun. 30, 2017 | 17,288 | $ 4 | 5,195 | 13,282 | (1,687) | 494
Common Shares Outstanding, at end of period at Jun. 30, 2017 |  | 362,820 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of accounting change net of income taxes |  |  |  | 5 |  | (5)
Adjusted balance, beginning of period |  |  |  | 9,647 |  | 658
Beginning balance at Dec. 31, 2017 | 13,494 |  | 4,379 | 9,642 | (1,194) | 663
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of shares under incentive and stock compensation plans |  |  | (83) |  |  |
Stock-based compensation plans expense |  |  | 83 |  |  |
Issuance of shares for warrant exercise |  |  | (5) |  | 5 |
Net income | 1,179 |  |  | 1,179 |  |
Dividends declared on common stock |  |  |  | (177) |  |
Treasury stock acquired |  |  |  |  | 0 |
Issuance of shares under incentive and stock compensation plans |  |  |  |  | 95 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  | 34 |
Total other comprehensive income (loss) |  |  |  |  |  | (2,011)
Ending balance at Jun. 30, 2018 | 12,546 | $ 4 | 4,374 | 10,649 | (1,128) | (1,353)
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2017 |  | 356,835 |  |  |  |
Stock Issued or Granted During Period, Share-based Compensation [Abstract] |  |  |  |  |  |
Treasury stock acquired |  | 0 |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 2,042 |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  | 637 |  |  |  |
Issuance of shares for warrant exercise |  | 119 |  |  |  |
Common Shares Outstanding, at end of period at Jun. 30, 2018 |  | 358,359 |  |  |  |
Beginning balance at Mar. 31, 2018 |  |  |  |  |  | (239)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 582 |  |  |  |  |
Ending balance at Jun. 30, 2018 | $ 12,546 | $ 4 | $ 4,374 | $ 10,649 | $ (1,128) | $ (1,353)
Common Shares Outstanding, at end of period at Jun. 30, 2018 |  | 358,359 |  |  |  |

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