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Debt (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2023 | Mar. 31, 2024 | Feb. 29, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commercial paper outstanding |  | $ 50,000,000 |  | $ 0 |  |  |  |
Debt, weighted average interest rate |  |  |  |  |  |  | 5.19% |
Other Debt Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, amount outstanding |  | 0 |  | 0 |  |  |  |
Other credit and overdraft facilities |  | 114,000,000 |  | 113,000,000 |  |  |  |
Letters of credit |  | $ 128,000,000 |  | 139,000,000 |  |  |  |
3.875% Senior Debt Obligations October 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 3.875% |  |  |  |  |  |
Senior notes – 5.150% due 2034 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 5.15% | 5.15% |  |  |  |  |
Senior notes – 5.450% due 2054 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 5.45% | 5.45% |  |  |  |  |
4.05% Senior Debt Obligations October 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 4.05% |  |  |  |  |  |  |
Senior notes – 5.400% due 2033 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 5.40% |  |  |  | 5.40% |  |
5.700% Senior Debt Obligations Due 2053 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.70% |  |
Senior notes – 5.450% due 2053 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  | 5.45% |  |  |  |  | 5.45% |
Commercial paper |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term debt | $ 2,800,000,000 |  |  |  | $ 3,500,000,000 |  |  | $ 2,000,000,000
Effective interest rate (percent) |  | 5.45% |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |
Revolving credit facility, borrowing capacity | $ 3,500,000,000 |  |  |  |  |  |  |
Revolving credit facility | New Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, borrowing capacity |  |  |  |  |  | $ 2,800,000,000 |  |
Revolving credit facility, amount outstanding |  | $ 0 |  | $ 0 |  |  |  |
Revolving credit facility | Uncommitted Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, term | 1 year |  |  |  |  |  |  |
Revolving credit facility, amount outstanding |  |  |  |  |  |  | $ 250,000,000 |
Senior Notes | 3.875% Senior Debt Obligations October 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 1,000,000,000 |  |  |  |  |  |
Senior Notes | Senior notes – 5.150% due 2034 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 500,000,000 |  |  |  |  |
Senior Notes | Senior notes – 5.450% due 2054 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 500,000,000 |  |  |  |  |
Senior Notes | 4.05% Senior Debt Obligations October 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 250,000,000 |  |  |  |  |  |  |
Senior Notes | Senior notes – 5.400% due 2033 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | 600,000,000 |  |
Senior Notes | 5.700% Senior Debt Obligations Due 2053 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | $ 1,000,000,000 |  |
Senior Notes | Senior notes – 5.450% due 2053 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  | $ 600,000,000 |

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