Debt coverage ratio.

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Debt Instrument, Covenant, Availability plus Suppressed Availability

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Debt Instrument, Covenant, Percent of Loan Cap

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Debt Instrument, Liquidation Percentage

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Line of credit facility old agreement expiration date.

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Line of credit maximum borrowing capacity under old agreement.

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Line of Credit Facility, Additional Borrowing Capacity Available

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Fair value amount of debt instrument that was repurchased.

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Gross amount of debt extinguished.

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

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Date the credit facility terminates, in YYYY-MM-DD format.

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Maximum amount borrowed under the credit facility at any time during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Financing Activities (Narrative) (Details) - USD ($) shares in Millions				3 Months Ended			6 Months Ended
	Mar. 10, 2022	Mar. 08, 2022	Mar. 03, 2022	Jul. 30, 2022	Apr. 30, 2022	Jul. 31, 2021	Jul. 30, 2022	Jul. 31, 2021
Face amount	$ 850,000,000
Losses on early retirement of debt				$ 0	$ 31,000,000	$ 3,000,000	$ 31,000,000	$ 14,000,000
Number of shares repurchased							24
Shares repurchased, value							$ 600,000,000
Stock repurchase program, remaining authorized repurchase amount				$ 1,400,000,000			$ 1,400,000,000
Senior Secured Notes
Extinguishment of debt		$ 8,000,000
Debt Instrument, Repurchase Amount		8,000,000
5.875% Senior Notes due 2030 [Member]
Debt instrument interest rate, stated percentage	5.875%
Face amount	$ 425,000,000
Debt instrument, maturity date	Mar. 15, 2030
6.125% Senior Notes due 2032 [Member]
Debt instrument interest rate, stated percentage	6.125%
Face amount	$ 425,000,000
Debt instrument, maturity date	Mar. 15, 2032
Six Point Six Five Senior Secured Debentures Due Two Thousand Twenty Four
Extinguishment of debt		$ 2,000,000
Debt instrument interest rate, stated percentage		6.65%
Six Point Seven Percentage Senior Secured Debentures Due Two Thousand Twenty Eight
Extinguishment of debt		$ 1,000,000
Debt instrument interest rate, stated percentage		6.70%
Seven Point Eight Seven Five Percent Senior Secured Debentures Due Two Thousand Thirty
Extinguishment of debt		$ 10,000
Debt instrument interest rate, stated percentage		7.875%
Six Point Nine Percent Senior Secured Debentures Due Twenty Thousand Thirty Two
Extinguishment of debt		$ 4,000,000
Debt instrument interest rate, stated percentage		6.90%
Six Point Seven Percent Senior Secured Debentures Due Two Thousand Thirty Four
Extinguishment of debt		$ 2,000,000
Debt instrument interest rate, stated percentage		6.70%
New ABL Credit Facility
Percent of loan cap				10.00%			10.00%
Availability plus suppressed availability				$ 250,000,000			$ 250,000,000
ABL Borrower \| New ABL Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity				$ 3,000,000,000.0			$ 3,000,000,000.0
Line of Credit Facility, Expiration Date							Mar. 31, 2027
Liquidation percentage				90.00%			90.00%
Coverage ratio							1.00 to 1.00
ABL Borrower \| New ABL Credit Facility \| Credit Spread [Member]
Basis spread on variable rate							0.10%
ABL Borrower \| New ABL Credit Facility \| Minimum [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Basis spread on variable rate							1.25%
ABL Borrower \| New ABL Credit Facility \| Minimum [Member] \| Base Rate
Basis spread on variable rate							0.25%
ABL Borrower \| New ABL Credit Facility \| Maximum [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Basis spread on variable rate							1.50%
ABL Borrower \| New ABL Credit Facility \| Maximum [Member] \| Base Rate
Basis spread on variable rate							0.50%
ABL Borrower \| Revolving Credit Facility
Additional borrowing capacity available				$ 750,000,000			$ 750,000,000
ABL Borrower \| Revolving Credit Facility \| Revolving A B L Facility
Line of Credit Facility, Maximum Borrowing Capacity				2,935,000,000			2,935,000,000
Line of credit maximum borrowing capacity under old agreement			$ 2,941,000,000
Line Of Credit Facility Old Agreement Expiration Date			May 31, 2024
Letters of Credit Outstanding, Amount				$ 65,000,000			65,000,000
Line of credit facility, maximum amount outstanding during period							$ 0	$ 0