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Shareholders' Equity	12 Months Ended
	Dec. 31, 2018
Shareholders’ Equity [Abstract]
Shareholders' Equity	8. Shareholders’ Equity Through December 31, 2018, we had announced authorizations by our Board of Directors of repurchases of shares of common stock, which in the aggregate, authorized expenditures of up to $2.5 billion. On February 6, 2019, we announced that our Board of Directors authorized the repurchase of up to an additional $100,000 for repurchase of shares of common stock. Under the remaining repurchase authorizations, shares may be purchased from time to time in open market transactions, subject to market conditions.  As of December 31, 2018, $57,551 was available to be repurchased under previously-announced repurchase programs. Shares repurchased are being held in treasury stock until they are reissued or retired at the discretion of the Board of Directors. During 2018, 2017, and 2016, shares of common stock were netted and surrendered as payment for minimum statutory tax withholding obligations in connection with the exercise and vesting of outstanding stock awards. We deem shares surrendered by the participants in accordance with the applicable award agreements and plan as repurchased, but do not deem such shares to be part of publicly announced share repurchase programs.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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