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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

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Debt - Summary of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2020	Apr. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Total debt	$ 20,750
Unamortized discounts and debt issuance costs	(134)		$ (108)
Hedge accounting fair value adjustments	263		87
Total carrying value of debt	20,879		16,729
Current maturities of debt	2,999		0
Long-term debt	17,880		16,729
Senior Notes
Debt Instrument [Line Items]
Total debt	20,750		16,750
Total carrying value of debt	20,900		16,700
Senior Notes \| 2.20% Senior Notes due December 2020
Debt Instrument [Line Items]
Total debt	$ 3,000		3,000
Effective interest rate (percent)	2.30%
Stated interest rate (percent)	2.20%
Senior Notes \| 2.15% Senior Notes due September 2022
Debt Instrument [Line Items]
Total debt	$ 1,000		1,000
Effective interest rate (percent)	2.30%
Stated interest rate (percent)	2.15%
Senior Notes \| 2.80% Senior Notes due December 2022
Debt Instrument [Line Items]
Total debt	$ 2,250		2,250
Effective interest rate (percent)	2.89%
Stated interest rate (percent)	2.80%
Senior Notes \| 3.15% Senior Notes due December 2025
Debt Instrument [Line Items]
Total debt	$ 4,000		4,000
Effective interest rate (percent)	3.26%
Stated interest rate (percent)	3.15%
Senior Notes \| 1.90% Senior Notes due April 2027
Debt Instrument [Line Items]
Total debt	$ 1,500		0
Effective interest rate (percent)	2.02%
Stated interest rate (percent)	1.90%	1.90%
Senior Notes \| 2.75% Senior Notes due September 2027
Debt Instrument [Line Items]
Total debt	$ 750		750
Effective interest rate (percent)	2.91%
Stated interest rate (percent)	2.75%
Senior Notes \| 2.05% Senior Notes due April 2030
Debt Instrument [Line Items]
Total debt	$ 1,500		0
Effective interest rate (percent)	2.13%
Stated interest rate (percent)	2.05%
Senior Notes \| 4.15% Senior Notes due December 2035
Debt Instrument [Line Items]
Total debt	$ 1,500		1,500
Effective interest rate (percent)	4.23%
Stated interest rate (percent)	4.15%
Senior Notes \| 2.70% Senior Notes due April 2040
Debt Instrument [Line Items]
Total debt	$ 1,000		0
Effective interest rate (percent)	2.80%
Stated interest rate (percent)	2.70%
Senior Notes \| 4.30% Senior Notes due December 2045
Debt Instrument [Line Items]
Total debt	$ 3,500		3,500
Effective interest rate (percent)	4.37%
Stated interest rate (percent)	4.30%
Senior Notes \| 3.65% Senior Notes due September 2047
Debt Instrument [Line Items]
Total debt	$ 750		$ 750
Effective interest rate (percent)	3.73%
Stated interest rate (percent)	3.65%