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Pension Benefits Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Defined Benefit Pension Plan, Postemployment Benefit Period	5 years
Liability, Other Retirement Benefits	$ 4	$ 4

X

- Definition

Defined Benefit Pension Plan, Postemployment Benefit Period

+ References

No definition available.

+ Details

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Balance Type:	na
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- References

No definition available.

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X

- Definition

Amount of liability for retirement benefits, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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