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Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Long-Term Debt	$ 17,621	$ 17,940
1.208% Notes due June 4, 2026
Debt Instrument [Line Items]
Interest rate (percent)	1.208%
Long-Term Debt	$ 0	671
6.700% Notes due December 1, 2026
Debt Instrument [Line Items]
Interest rate (percent)	6.70%
Long-Term Debt	$ 154	158
1.900% Notes due December 15, 2026
Debt Instrument [Line Items]
Interest rate (percent)	1.90%
Long-Term Debt	$ 586	559
3.700% Notes due June 6, 2027
Debt Instrument [Line Items]
Interest rate (percent)	3.70%
Long-Term Debt	$ 1,722	1,721
7.000% Debentures due August 1, 2027
Debt Instrument [Line Items]
Interest rate (percent)	7.00%
Long-Term Debt	$ 117	118
4.693% Notes due February 13, 2028
Debt Instrument [Line Items]
Interest rate (percent)	4.693%
Long-Term Debt	$ 798	797
6.700% Debentures due August 1, 2028
Debt Instrument [Line Items]
Interest rate (percent)	6.70%
Long-Term Debt	$ 114	115
0.334% Notes due August 13, 2028
Debt Instrument [Line Items]
Interest rate (percent)	0.334%
Long-Term Debt	$ 1,054	1,004
4.874% Notes due February 8, 2029
Debt Instrument [Line Items]
Interest rate (percent)	4.874%
Long-Term Debt	$ 622	622
5.081% Notes due June 7, 2029
Debt Instrument [Line Items]
Interest rate (percent)	5.081%
Long-Term Debt	$ 597	596
3.553% Notes due September 13, 2029
Debt Instrument [Line Items]
Interest rate (percent)	3.553%
Long-Term Debt	$ 936	891
2.823% Notes due May 20, 2030
Debt Instrument [Line Items]
Interest rate (percent)	2.823%
Long-Term Debt	$ 747	746
3.519% Notes due February 8, 2031
Debt Instrument [Line Items]
Interest rate (percent)	3.519%
Long-Term Debt	$ 876	835
1.957% Notes due February 11, 2031
Debt Instrument [Line Items]
Interest rate (percent)	1.957%
Long-Term Debt	$ 995	994
3.828% Notes due June 7, 2032
Debt Instrument [Line Items]
Interest rate (percent)	3.828%
Long-Term Debt	$ 1,168	1,113
4.298% Notes due August 22, 2032
Debt Instrument [Line Items]
Interest rate (percent)	4.298%
Long-Term Debt	$ 496	496
5.110% Notes due February 8, 2034
Debt Instrument [Line Items]
Interest rate (percent)	5.11%
Long-Term Debt	$ 546	545
1.213% Notes due February 12, 2036
Debt Instrument [Line Items]
Interest rate (percent)	1.213%
Long-Term Debt	$ 701	668
4.029% Notes due June 7, 2036
Debt Instrument [Line Items]
Interest rate (percent)	4.029%
Long-Term Debt	$ 933	889
6.000% Notes due May 15, 2039
Debt Instrument [Line Items]
Interest rate (percent)	6.00%
Long-Term Debt	$ 121	121
5.000% Notes due November 12, 2040
Debt Instrument [Line Items]
Interest rate (percent)	5.00%
Long-Term Debt	$ 90	90
1.336% Notes due August 13, 2041
Debt Instrument [Line Items]
Interest rate (percent)	1.336%
Long-Term Debt	$ 1,049	999
4.875% Notes due May 15, 2044
Debt Instrument [Line Items]
Interest rate (percent)	4.875%
Long-Term Debt	$ 244	244
4.685% Notes due December 15, 2044
Debt Instrument [Line Items]
Interest rate (percent)	4.685%
Long-Term Debt	$ 938	934
4.669% Notes due June 6, 2047
Debt Instrument [Line Items]
Interest rate (percent)	4.669%
Long-Term Debt	$ 1,462	1,460
3.794% Notes due May 20, 2050
Debt Instrument [Line Items]
Interest rate (percent)	3.794%
Long-Term Debt	$ 554	554
Other long-term debt
Debt Instrument [Line Items]
Long-Term Debt	$ 1	$ 1

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