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Short And Long-Term Debt Loss on the Early Extinguishment of Debt (Details) - USD ($)	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019	[1]	Dec. 31, 2018		Dec. 31, 2017	[1]
Debt Disclosure [Abstract]
(Gain) loss on the early extinguishment of debt	$ (10,000,000)	$ 5,000,000	$ 7,000,000	$ (5,000,000)		$ 7,000,000	[1]	$ 5,000,000
Debt Instrument, Repurchase Amount	$ 93
Write off of Deferred Debt Issuance Cost						$ 2,000,000
[1] Former parent legacy items and (Gain) loss on the early extinguishment of debt are recorded in Corporate and Other.

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- Definition

Fair value amount of debt instrument that was repurchased.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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