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SHAREHOLDER'S EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Treasury Stock by Class [Table Text Block] | Share repurchase activity (in millions, except shares):
| 2017 |  | 2016 |  | 2015
| Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount
2015 Repurchase Program – $1 billion | 981,277 |  |  | $ | 75 |  |  | 2,594,809 |  |  | $ | 193 |  |  | 1,517,277 |  |  | $ | 120 |
2014 Repurchase Program – $650 million | — |  |  | — |  |  | — |  |  | — |  |  | 5,691,051 |  |  | 385 |
Total | 981,277 |  |  | $ | 75 |  |  | 2,594,809 |  |  | $ | 193 |  |  | 7,208,328 |  |  | $ | 505 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | AOCL consisted of the following (in millions, net of tax):
| 2017 |  | 2016
Related to marketable securities | $ | (5 | ) |  | $ | (3 | )
Related to employee benefit plans | (376 | ) |  | (299 | )
Related to interest rate derivatives | 1 |  |  | (3 | )
| $ | (380 | ) |  | $ | (305 | )
In relation to the Tax Cuts and Jobs Act, amounts recognized in other comprehensive income subsequent to the December 22, 2017 enactment date, are taxed at the revised federal income tax rates. The Company's actuarial adjustments for employee benefit plans occur annually at December 31, and therefore are tax effected at the new lower rates. Accordingly, the effective tax rate for employee benefit plan amounts recognized in other comprehensive income at December 31, 2017 is lower than it historically has been.

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