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Fair Value (Liabilities Measured on Recurring Basis) (Details) - Redeemable Noncontrolling Interests - Level 3 - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning of period $ (305) $ (189)
Net income (4) (9)
Distributions 6 8
Accretion (7) (17)
End of period $ (310) $ (207)