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Employee Retirement Benefit Plans-Fiscal Year Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Jun. 30, 2022
Retirement Benefits [Member]    
Expected Future Benefit Payments    
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 14 $ 14
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 15 13
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 16 14
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 15 16
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 15 14
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 84 $ 80
Actual Asset Allocation (percent) 100.00% 100.00%
Actual Asset Allocation $ 202 $ 240
Target Asset Allocation (percent) 100.00% 100.00%
Retirement Benefits [Member] | Equity Securities [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 2.90% 4.10%
Actual Asset Allocation $ 6 $ 10
Target Asset Allocation (percent) 2.90% 4.10%
Retirement Benefits [Member] | US Government Agencies Debt Securities [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 36.80% 35.60%
Actual Asset Allocation $ 74 $ 85
Target Asset Allocation (percent) 36.80% 35.60%
Retirement Benefits [Member] | Corporate Debt Securities [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 16.20% 18.30%
Actual Asset Allocation $ 33 $ 44
Target Asset Allocation (percent) 16.20% 18.30%
Retirement Benefits [Member] | Real Estate [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 3.30% 4.90%
Actual Asset Allocation $ 7 $ 12
Target Asset Allocation (percent) 3.30% 4.90%
Retirement Benefits [Member] | Insurance Contracts [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 14.90% 12.00%
Actual Asset Allocation $ 30 $ 29
Target Asset Allocation (percent) 14.90% 12.00%
Retirement Benefits [Member] | Other Assets [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 21.40% 25.10%
Actual Asset Allocation $ 43 $ 60
Target Asset Allocation (percent) 21.40% 25.10%
Other Post-Retirement Benefits [Member]    
Expected Future Benefit Payments    
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 0 $ 0
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 0 0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 0 0
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 0 0
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 0 0
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter $ 1 $ 1
Actual Asset Allocation (percent) 0.00% 0.00%
Actual Asset Allocation $ 0 $ 0
Target Asset Allocation (percent) 0.00% 0.00%
Other Post-Retirement Benefits [Member] | Equity Securities [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 0.00% 0.00%
Actual Asset Allocation $ 0 $ 0
Target Asset Allocation (percent) 0.00% 0.00%
Other Post-Retirement Benefits [Member] | US Government Agencies Debt Securities [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 0.00% 0.00%
Actual Asset Allocation $ 0 $ 0
Target Asset Allocation (percent) 0.00% 0.00%
Other Post-Retirement Benefits [Member] | Corporate Debt Securities [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 0.00% 0.00%
Actual Asset Allocation $ 0 $ 0
Target Asset Allocation (percent) 0.00% 0.00%
Other Post-Retirement Benefits [Member] | Real Estate [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 0.00% 0.00%
Actual Asset Allocation $ 0 $ 0
Target Asset Allocation (percent) 0.00% 0.00%
Other Post-Retirement Benefits [Member] | Insurance Contracts [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 0.00% 0.00%
Actual Asset Allocation $ 0 $ 0
Target Asset Allocation (percent) 0.00% 0.00%
Other Post-Retirement Benefits [Member] | Other Assets [Member]    
Expected Future Benefit Payments    
Actual Asset Allocation (percent) 0.00% 0.00%
Actual Asset Allocation $ 0 $ 0
Target Asset Allocation (percent) 0.00% 0.00%