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Summary of Signficant Accounting Policies Treasury Stock (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 25, 2019
Treasury Stock [Abstract]
Stock Repurchased During Period, Shares	10.9	2.3
Stock Repurchase Program, Authorized Amount	$ 1,000,000	$ 500,000		$ 500,000
Payments for Repurchase of Common Stock	291,813	$ 60,000	$ 0
Stock Repurchase Program Remaining Authorized Repurchases, Amount	$ 648,000

X

- Definition

Stock Repurchase Program Remaining Authorized Repurchases, Amount

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Treasury Stock [Abstract]

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X

- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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Amount of 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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