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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions		9 Months Ended
	Dec. 07, 2017	Sep. 30, 2018	Sep. 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
Repurchase Program | Common Stock
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
ASR Program | Goldman
Equity, Class of Treasury Stock [Line Items]
Shares repurchased			7.3
Repurchase of common stock	$ 274,000,000		$ 2,000,000,000
Final average price per share paid (in dollars per share)	$ 310.32

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- Definition

Increased to authorized shares repurchase amount for Stock Repurchase Program

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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

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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)
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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
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