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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Billions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Feb. 28, 2019
Stockholders Equity [Abstract]
Percentage of increase to quarterly dividend	12.50%				12.50%
Common stock dividends, rate per share	$ 0.09	$ 0.08	$ 0.08	$ 0.06
Share Repurchase Program [Member]
Stockholders Equity [Abstract]
Share-repurchase program, additional authorized amount			$ 3.0			$ 1.0
Share-repurchase program expiration date					Dec. 31, 2019
Share Repurchase Program [Member] | Maximum [Member]
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount				$ 1.0		$ 5.0

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- Definition

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

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