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Shareholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Schedule of Stockholders Equity | The following tables provide changes in shareholders’ equity during the three months ended March 31, 2019 and 2018.
| Three Months Ended March 31, 2019 |  | Number of Shares |  | Amount
| (In millions) |  | Common Shares |  | Treasury Shares |  | Common Stock |  | Additional Paid-In Capital |  | Accumulated Other Comprehensive Loss |  | Retained Earnings |  | Treasury Stock |  | Total Equity
| Balance at December 31, 2018 |  | 791 |  |  | 399 |  |  | $ | 8 |  |  | $ | 1,057 |  |  | $ | (67 | ) |  | $ | 11,635 |  |  | $ | (10,340 | ) |  | $ | 2,293 |
| Net income |  |  |  |  |  |  |  |  |  |  |  | 225 |  |  |  |  | 225 |
| Other comprehensive loss |  |  |  |  |  |  |  |  |  | (18 | ) |  |  |  |  |  | (18 | )
| Share-based compensation |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  | 19 |
| Shares issued under stock plans |  |  |  | (2 | ) |  |  |  | (42 | ) |  |  |  |  |  | 37 |  |  | (5 | )
| Purchases of treasury stock |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  | (120 | ) |  | (120 | )
| Balance at March 31, 2019 |  | 791 |  |  | 399 |  |  | $ | 8 |  |  | $ | 1,034 |  |  | $ | (85 | ) |  | $ | 11,860 |  |  | $ | (10,423 | ) |  | $ | 2,394 |
| Three Months Ended March 31, 2018 |  | Number of Shares |  | Amount
| (In millions) |  | Common Shares |  | Treasury Shares |  | Common Stock |  | Additional Paid-In Capital |  | Accumulated Other Comprehensive Loss |  | Retained Earnings |  | Treasury Stock |  | Total Equity
| Balance at December 31, 2017 |  | 791 |  |  | 376 |  |  | $ | 8 |  |  | $ | 1,031 |  |  | $ | (54 | ) |  | $ | 10,240 |  |  | $ | (8,494 | ) |  | $ | 2,731 |
| Net income |  |  |  |  |  |  |  |  |  |  |  | 423 |  |  |  |  | 423 |
| Other comprehensive loss |  |  |  |  |  |  |  |  |  | (2 | ) |  |  |  |  |  | (2 | )
| Share-based compensation |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  | 19 |
| Shares issued under stock plans |  |  |  | (2 | ) |  |  |  | (45 | ) |  |  |  |  |  | 35 |  |  | (10 | )
| Purchases of treasury stock |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  | (398 | ) |  | (398 | )
| Cumulative-effect adjustment of ASU 2014-09 adoption |  |  |  |  |  |  |  |  |  |  |  | 208 |  |  |  |  | 208 |
| Cumulative-effect adjustment of ASU 2017-12 adoption |  |  |  |  |  |  |  |  |  | 3 |  |  | (3 | ) |  |  |  | — |
| Cumulative-effect adjustment of ASU 2018-02 adoption |  |  |  |  |  |  |  |  |  | (3 | ) |  | 3 |  |  |  |  | — |
| Balance at March 31, 2018 |  | 791 |  |  | 380 |  |  | $ | 8 |  |  | $ | 1,005 |  |  | $ | (56 | ) |  | $ | 10,871 |  |  | $ | (8,857 | ) |  | $ | 2,971 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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