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Share Repurchase Program - (Narrative) (Details) - USD ($) $ in Billions	Sep. 30, 2018	Jul. 20, 2017
Equity [Abstract]
Stock repurchase program authorized amount		$ 4.0
Remaining amount available for stock repurchase	$ 2.8

X

- References

No definition available.

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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