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Leases Schedule of Lease Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Leases [Abstract]    
Operating Lease, Cost $ 31 $ 92
Amortization of right-of-use assets 1 9
Total finance lease cost 1 9
Variable lease cost 5 17
Total lease cost $ 37 $ 118