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Condensed Consolidated Statements of Changes in Stockholders' Equity 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 |  |  | (66) |  |  |
Stock-based compensation plans expense |  |  | 36 |  |  |
Issuance of shares for warrant exercise |  |  | 40 |  | (40) |
Net Income (Loss) Attributable to Parent | $ 378 |  |  | 378 |  |
Dividends declared on common stock |  |  |  | (86) |  |
Treasury stock acquired |  |  |  |  | (325) |
Issuance of shares under incentive and stock compensation plans |  |  |  |  | 72 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  | 33 |
Total other comprehensive income |  |  |  |  |  | 130
Ending balance at Mar. 31, 2017 | 17,009 | $ 4 | 5,177 | 13,406 | (1,371) | (207)
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 |  | 6,709 |  |  |  |
Issuance of shares under incentive and stock compensation plans |  | 1,690 |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  | 674 |  |  |  |
Issuance of shares for warrant exercise |  | 940 |  |  |  |
Common Shares Outstanding, at end of period at Mar. 31, 2017 |  | 369,196 |  |  |  |
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 |  |  | (74) |  |  |
Stock-based compensation plans expense |  |  | 61 |  |  |
Issuance of shares for warrant exercise |  |  | 3 |  | (3) |
Net Income (Loss) Attributable to Parent | 597 |  |  | 597 |  |
Dividends declared on common stock |  |  |  | (88) |  |
Treasury stock acquired |  |  |  |  | 0 |
Issuance of shares under incentive and stock compensation plans |  |  |  |  | 81 |
Net shares acquired related to employee incentive and stock compensation plans |  |  |  |  | 31 |
Total other comprehensive income |  |  |  |  |  | (897)
Ending balance at Mar. 31, 2018 | $ 13,143 | $ 4 | $ 4,363 | $ 10,156 | $ (1,141) | $ (239)
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 |  | 1,770 |  |  |  |
Return of shares under incentive and stock compensation plans to treasury stock |  | 595 |  |  |  |
Issuance of shares for warrant exercise |  | 67 |  |  |  |
Common Shares Outstanding, at end of period at Mar. 31, 2018 |  | 358,077 |  |  |  |

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