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Shareholders' Equity (Notes) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Shareholders' Equity | Shareholders’ 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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- References No definition available. + Details
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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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