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SHAREHOLDER'S EQUITY - COMMON STOCK REPURCHASE (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 31, 2015 | May 01, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock repurchase (in shares) | 2,594,809 | 7,208,328 | 7,316,731 |  |
Common stock repurchase | $ 193 | $ 505 | $ 348 |  |
2015 $1 billion Repurchase Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share repurchase program, authorized amount |  |  |  | $ 1,000 |
Common stock repurchase (in shares) | 2,594,809 | 1,517,277 | 0 |  |
Common stock repurchase | $ 193 | $ 120 | $ 0 |  |
2014 $650 million Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  | $ 650
Common stock repurchase (in shares) | 0 | 5,691,051 | 5,497,427 |  |
Common stock repurchase | $ 0 | $ 385 | $ 265 |  |
2012 $250 million Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock repurchase (in shares) | 0 | 0 | 1,819,304 |  |
Common stock repurchase | $ 0 | $ 0 | $ 83 |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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=6928386&loc=d3e21463-112644 + Details
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