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Pension and Other Post-Retirement Plans - Defined Benefit Plan with Projected Benefit Obligations in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Retirement Benefits [Abstract]    
Projected benefit obligation $ 1,387 $ 1,695
Accumulated benefit obligation 1,352 1,626
Fair value of plan assets $ 1,072 $ 1,292