Long-term Debt Exchange of Notes (Details) $ in Millions	3 Months Ended
Aug. 04, 2018 USD ($)
Debt Conversion [Line Items]
Debt Exchange, Cash Consideration Paid	$ 52
Debt Exchange, Exchange Premium	24
With Subsidiary Guarantee [Member] \| Fixed Rate 6.625 Percent Notes Due April 2021 [Member]
Debt Conversion [Line Items]
Debt Conversion, Original Debt, Amount	220
With Subsidiary Guarantee [Member] \| Fixed Rate 5.625 Percent Notes Due February 2022 [Member]
Debt Conversion [Line Items]
Debt Conversion, Original Debt, Amount	44
With Subsidiary Guarantee [Member] \| Fixed Rate 6.694% Notes Due January 2027 [Member]
Debt Conversion [Line Items]
Debt Conversion, Converted Instrument, Amount	$ 297
Debt Conversion, Converted Instrument, Rate	6.694%
With Subsidiary Guarantee [Member] \| Fixed Rate 7.00% Notes Due May 2020 [Member]
Debt Conversion [Line Items]
Debt Conversion, Original Debt, Amount	$ 62

Debt Exchange, Cash Consideration Paid

No definition available.

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- Definition

Debt Exchange, Exchange Premium

+ References

No definition available.

+ Details

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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

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- Definition

Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

+ Details

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