Borrowings (Schedule of Senior notes) (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Senior notes	$ 8,000,000,000	$ 6,800,000,000
Less: unamortized discount and debt issuance costs	(54,000,000)	(49,000,000)
Total borrowings	7,946,000,000	6,751,000,000
Senior notes \| 3.666% senior notes due 2022
Debt Instrument [Line Items]
Senior notes	750,000,000	750,000,000
Senior notes \| 4.030% senior notes due 2024
Debt Instrument [Line Items]
Senior notes	1,250,000,000	1,250,000,000
Senior notes \| 3.050% senior notes due 2025
Debt Instrument [Line Items]
Senior notes	600,000,000	0
Senior notes \| 4.709% senior notes due 2029
Debt Instrument [Line Items]
Senior notes	2,000,000,000	2,000,000,000
Senior notes \| 3.500% senior notes due 2030
Debt Instrument [Line Items]
Senior notes	600,000,000	0
Senior notes \| 5.476% senior notes due 2039
Debt Instrument [Line Items]
Senior notes	1,250,000,000	1,250,000,000
Senior notes \| 5.576% senior notes due 2049
Debt Instrument [Line Items]
Senior notes	$ 1,550,000,000	$ 1,550,000,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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