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Pension and Other Postretirement Benefits-Defined Benefit (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]    
Accumulated other comprehensive loss transferred from 21CF, net of tax   $ 157
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Assets received from 21CF $ 0 630
Projected benefit obligations assumed from 21CF 0 765
Accumulated other comprehensive loss transferred from 21CF   188
Accumulated other comprehensive loss transferred from 21CF, net of tax   143
Accumulated benefit obligation $ 1,273 1,113
Pension Benefits | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations (percentage) 50.00%  
Pension Benefits | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations (percentage) 25.00%  
Pension Benefits | Other    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations (percentage) 25.00%  
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Assets received from 21CF $ 0 0
Projected benefit obligations assumed from 21CF $ 0 98
Accumulated other comprehensive loss transferred from 21CF   18
Accumulated other comprehensive loss transferred from 21CF, net of tax   $ 14