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Derivative Instruments - Schedule of Fair Value Hedging Instruments Recognized in Income (Details) - Fair Value Hedging - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Derivative [Line Items]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (14) $ (1) $ 7
Interest expense | Interest rate swaps      
Derivative [Line Items]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ (14) $ (1) $ 7