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STOCKHOLDERS' EQUITY - Share Repurchases and Dividends (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended			6 Months Ended		23 Months Ended
	Jul. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016	Jul. 12, 2018	Feb. 07, 2018	Sep. 06, 2017	May 30, 2017	Feb. 28, 2017	Feb. 17, 2015
Subsequent Event [Line Items]
Stock repurchase program, authorized amount									$ 325,000,000	$ 225,000,000	$ 280,000,000	$ 350,000,000	$ 200,000,000
Stock repurchased during period, value							$ 131,000,000
Treasury stock acquired (in shares)					8.0
Treasury stock acquired, cost method					$ 325,000,000
Dividends declared (in dollars per share)		$ 0.10	$ 0.10	$ 0.08	$ 0.20	$ 0.16
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, authorized amount								$ 300,000,000
Dividends declared (in dollars per share)	$ 0.10

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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