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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Dec. 07, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock |  | $ 0 | $ 2,000,000,000 |
Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Remaining amount of share repurchases authorized |  | 717,500,000 |  |
ASR Program | Goldman |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of common stock | $ 274,000,000 |  | $ 2,000,000,000 |
Shares repurchased |  |  | 7.3 |
Final average price per share paid (in dollars per share) | $ 310.32 |  |  |
Common Stock | Repurchase Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Amount of share repurchases authorized |  | $ 6,200,000,000.0 |  |
Stock repurchase program, increased to authorized amount |  |  |  | $ 3,000,000,000.0

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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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=84159872&loc=d3e21463-112644 + Details
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