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Debt - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2023 | Jan. 31, 2023 | Apr. 01, 2022 | Mar. 31, 2022 | Feb. 28, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt, weighted average interest rate |  | 3.43% | 1.00% |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 3,250 |  |  |
Aggregate annual maturities of long-term debt, 2024 |  | $ 1,625 |  |  |  |  |  |  |
Aggregate annual maturities of long-term debt, 2025 |  | 2,161 |  |  |  |  |  |  |
Aggregate annual maturities of long-term debt, 2026 |  | 1,073 |  |  |  |  |  |  |
Aggregate annual maturities of long-term debt, 2027 |  | 2,916 |  |  |  |  |  |  |
Aggregate annual maturities of long-term debt, 2028 |  | 2,183 |  |  |  |  |  |  |
Letters Of Credit Issuable Under Credit Facility |  |  |  |  |  | 100 |  |  |
Swingline Loans Issuable Under Credit Facility |  |  |  |  |  | 194 |  |  |
Line Of Credit Facility Maximum Additional Principal Amount Commitments |  |  |  |  |  | 500 |  |  |
Loss from reverse treasury locks |  |  | $ 17 |  |  |  |  |  |
Long-Term Debt |  | 14,738 | 13,886 |  |  |  |  |  |
Losses on debt extinguishment |  | 0 | 24 | $ 178 |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  |  | $ 1,266 |
Commercial Paper |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 2,750 |  |  |  |
Short-term Debt |  | $ 0 | $ 230 |  |  |  |  |  |
Notes 5.000% due February 15, 2030 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 500
Interest rate |  |  |  |  |  |  |  |  | 5.00%
Notes 6.750% due February 15, 2030 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 200 |  |
Interest rate |  |  |  |  |  |  | 6.75% |  |
Floating Rate Notes Due June 6, 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  | $ 199 |  |
Losses on debt extinguishment | $ 2 |  |  |  |  |  |  |  |
Floating Rate Notes Due June 6, 2022 | Long-term Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  | $ 199 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |
Borrowings under credit facility |  | $ 0 |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  | $ 2,750 |  | 500 |
Term Loan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 950 |

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