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Impact on Previously Issued Financial Statements for the Correction of an Error (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Accounting Changes and Error Corrections [Abstract]
Cumulative Effect on Retained Earnings, Net of Tax	$ 23

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- References

No definition available.

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794

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