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SHAREHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Treasury Stock by Class | Share repurchase activity (in millions, except share amounts):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount
2015 Repurchase Program—$1 billion | 204,078 |  |  | $ | 13 |  |  | 256,680 |  |  | $ | 22 |  |  | 389,739 |  |  | $ | 25 |  |  | 256,680 |  |  | $ | 22 |
Schedule of Accumulated Other Comprehensive Income (Loss) | Components of accumulated other comprehensive loss, net of tax (in millions):
| June 30, 2018 |  | December 31, 2017
Related to marketable securities | $ | (17 | ) |  | $ | (5 | )
Related to employee benefit plans | (425 | ) |  | (376 | )
Related to interest rate derivatives | 7 |  |  | 1 |
Total | $ | (435 | ) |  | $ | (380 | )

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