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Note 6 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions				3 Months Ended
	Apr. 19, 2018	Jan. 24, 2018	Apr. 20, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Oct. 22, 2015
Stock Repurchase Program, Authorized Amount							$ 500
Stock Repurchase Program, Additional Authorized Amount			$ 500
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 521
Treasury Stock, Shares, Acquired				0
Common Stock, Dividends, Per Share, Cash Paid					$ 0.23
Common Stock, Dividends, Per Share, Declared		$ 0.24		$ 0.24		$ 0.23
Dividends Payable, Date to be Paid		Feb. 23, 201
Dividends Payable, Date of Record		Feb. 09, 2018
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.24
Dividends Payable, Date to be Paid	May 18, 2018
Dividends Payable, Date of Record	May 04, 2018

X

- Definition

The additional amount of stock repurchase plan authorized.

+ References

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- Definition

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

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-SubTopic 10
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-Paragraph 1
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-Topic 230
-SubTopic 10
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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount remaining of a stock repurchase plan authorized.

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

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