Long-term Debt and Borrowing Facilities - Repurchase of Notes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Oct. 30, 2021	Apr. 30, 2022	Oct. 30, 2021	May 01, 2021		Sep. 30, 2021	Apr. 30, 2021
Repayment of debt		$ 0		$ 1,130	[1]
Gain (loss) on repurchase of debt instrument		$ 0		(105)	[1]
With Subsidiary Guarantee
Gain (loss) on repurchase of debt instrument			$ (89)	(105)
Gain (loss) on extinguishment of debt, net of tax			$ (68)	$ (80)
With Subsidiary Guarantee | 2023 Notes and 2025 Notes
Debt instrument, repurchase amount						$ 532
With Subsidiary Guarantee | 2023 Notes
Debt instrument, repurchased face amount						270
Debt instrument, redeemed amount	$ 50
Repayment of debt	$ 54
Fixed interest rate		5.625%
With Subsidiary Guarantee | 2025 Notes
Debt instrument, repurchased face amount						$ 180
Fixed interest rate		9.375%
With Subsidiary Guarantee | 2022 Notes
Debt instrument, repurchased face amount							$ 285
Fixed interest rate							5.625%
With Subsidiary Guarantee | 2025 Secured Notes
Debt instrument, repurchased face amount							$ 750
Fixed interest rate		6.875%

[1] The cash flows related to discontinued operations have not been segregated. Accordingly, the 2021 Consolidated Statement of Cash Flows includes the results of continuing and discontinued operations.