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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Amount of unamortized debt discount (premium) and debt issuance costs.

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Gross amount of debt extinguished.

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The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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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 cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Long-term Debt and Borrowing Facilities (Issuance And Repurchase Of Notes) (Narrative) (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 03, 2019	Jul. 06, 2019	Oct. 31, 2020	Aug. 01, 2020	Oct. 31, 2020	Nov. 02, 2019	Feb. 01, 2020
Debt Instrument, Face Amount			$ 6,449,000,000		$ 6,449,000,000	$ 5,458,000,000	$ 5,458,000,000
Proceeds from Issuance of Long-Term Debt, Net of Issuance Costs					2,219,000,000	486,000,000
Extinguishment of debt					1,259,000,000
Debt Instrument, Repurchase Amount		$ 669,000,000	844,000,000		1,307,000,000	799,000,000
Loss on Extinguishment of Debt					53,000,000	40,000,000
Extinguishment of Debt, Gain (Loss), Net of Tax					40,000,000	$ 30,000,000
Fixed Rate 6.625 Percent Notes Due April 2021 [Member]
Debt Instrument, Repurchase Amount			463,000,000
Fixed Rate 7.00% Notes Due May 2020 [Member]
Debt Instrument, Repurchase Amount	$ 130,000,000
With Subsidiary Guarantee [Member] \| 6.875% Fixed Interest Rate Secured Notes due July 2025 [Member]
Debt Instrument, Face Amount				$ 750,000,000
Debt instrument, stated rate				6.875%
Proceeds from Issuance of Debt				$ 739,000,000
Payments of Debt Issuance Costs				11,000,000
With Subsidiary Guarantee [Member] \| 9.375% Fixed Interest Rate Notes due July 2025 [Member]
Debt Instrument, Face Amount				$ 500,000,000
Debt instrument, stated rate				9.375%
Proceeds from Issuance of Debt				$ 492,000,000
Payments of Debt Issuance Costs				$ 8,000,000
With Subsidiary Guarantee [Member] \| Fixed Rate 5.625 Percent Notes Due February 2022 [Member]
Extinguishment of debt		96,000,000	576,000,000
With Subsidiary Guarantee [Member] \| Fixed Rate 6.625 Percent Notes Due April 2021 [Member]
Extinguishment of debt		330,000,000	450,000,000
With Subsidiary Guarantee [Member] \| Fixed Rate 7.00% Notes Due May 2020 [Member]
Extinguishment of debt	$ 126,000,000	$ 212,000,000
With Subsidiary Guarantee [Member] \| Fixed Rate 6.625% Notes Due October 2030 [Member]
Debt Instrument, Face Amount			$ 1,000,000,000		$ 1,000,000,000
Debt instrument, stated rate			6.625%		6.625%
Proceeds from Issuance of Debt			$ 988,000,000
Payments of Debt Issuance Costs			12,000,000		$ 12,000,000
With Subsidiary Guarantee [Member] \| Fixed Rate 5.625% Notes Due October 2023 [Member]
Extinguishment of debt			180,000,000
Without Subsidiary Guarantee [Member] \| Fixed Rate 7.60% Notes Due July 2037 [Member]
Extinguishment of debt			$ 53,000,000