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Capital Stock (Narrative) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Capital Stock [Abstract]
Authorized amount of shares repurchase	$ 669,000,000	$ 1,000,000,000
Preferred stock, shares authorized (in shares)	30,000,000	30,000,000

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- Definition

Capital Stock [Abstract]

+ References

No definition available.

+ Details

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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