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Equity - Summary of Capital Stock Activity (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Common stock, shares issued (in shares)	185,983,792	185,983,792	185,983,792	185,983,792
Treasury Stock [Roll Forward]
Treasury stock, shares, beginning (in shares)	51,653,236	52,293,686	52,328,015
Stock options and awards (in shares)	(390,553)	(640,450)	(244,329)
Repurchases of common stock, net (in shares)	2,439,495		210,000
Treasury stock, shares, ending (in shares)	53,702,178	51,653,236	52,293,686

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- Definition

Treasury Stock [Roll Forward]

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Topic 210
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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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

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