Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Description of debt redemption features under terms of the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 470
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt Debentures (Details) - USD ($) $ in Millions	4 Months Ended
Long-Term Debt Debentures (Details) - USD ($) $ in Millions	Jun. 16, 2018	Feb. 24, 2018	Dec. 02, 2017
Debt Instrument [Line Items]
Long-term debt	$ 1,432	$ 1,724
Debt Instrument, Redemption	220
Redemption Premium	$ 0
Write-off of unamortized debt financing costs	$ 0
Six Point Seven Five Percent Senior Notes Due June Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	6.75%		6.75%
Write-off of unamortized debt financing costs	$ 0
SevenPointSevenFivePercentSeniorNotesDueNovemberTwoThousandTwentyTwo [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	7.75%		7.75%
Senior Notes [Member] \| seven point seven five percent senior notes due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 350	350
Senior Notes [Member] \| six point seven five percent due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 180	$ 400