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Transactions with Related Parties - Schedule of Outstanding Principal Balance of Notes (Details)
$ in Millions
Jul. 31, 2021
USD ($)
5.625% Fixed Interest Rate Notes due October 2023  
Guarantor Obligations [Line Items]  
Fixed interest rate 5.625%
9.375% Fixed Interest Rate Notes due July 2025  
Guarantor Obligations [Line Items]  
Fixed interest rate 9.375%
6.694% Fixed Interest Rate Notes due January 2027  
Guarantor Obligations [Line Items]  
Fixed interest rate 6.694%
5.25% Fixed Interest Rate Notes due February 2028  
Guarantor Obligations [Line Items]  
Fixed interest rate 5.25%
7.50% Fixed Interest Rate Notes due June 2029  
Guarantor Obligations [Line Items]  
Fixed interest rate 7.50%
6.625% Fixed Interest Rate Notes due October 2030  
Guarantor Obligations [Line Items]  
Fixed interest rate 6.625%
6.875% Fixed Interest Rate Notes due November 2035  
Guarantor Obligations [Line Items]  
Fixed interest rate 6.875%
6.75% Fixed Interest Rate Notes due July 2036  
Guarantor Obligations [Line Items]  
Fixed interest rate 6.75%
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance $ 4,817
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 5.625% Fixed Interest Rate Notes due October 2023  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance 320
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 9.375% Fixed Interest Rate Notes due July 2025  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance 500
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 6.694% Fixed Interest Rate Notes due January 2027  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance 297
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 5.25% Fixed Interest Rate Notes due February 2028  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance 500
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 7.50% Fixed Interest Rate Notes due June 2029  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance 500
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 6.625% Fixed Interest Rate Notes due October 2030  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance 1,000
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 6.875% Fixed Interest Rate Notes due November 2035  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance 1,000
Financial Guarantee | Certain Subsidiaries and Other Subsidiaries of Parent | 6.75% Fixed Interest Rate Notes due July 2036  
Guarantor Obligations [Line Items]  
Guaranteed obligations, outstanding principal balance $ 700