Leases (Narrative) (Details) $ in Millions			9 Months Ended
	Sep. 19, 2019 USD ($) ft² state item	Dec. 22, 2016 USD ($) ft² state item	Sep. 30, 2019 USD ($) item
Capital Leased Assets [Line Items]
Proceeds from sale-lease back			$ 56
Operating lease right-of-use asset			$ 621
HCP, Inc. [Member]
Capital Leased Assets [Line Items]
Proceeds from sale-lease back		$ 159
Area of real estate property | ft²		756,183
Number of states the buildings are located | state		5
Number of financing obligations remain outstanding | item			6
Number of medical office buildings divested | item		10	4
Carter Validus Mission Critical REIT II, Inc [Member]
Capital Leased Assets [Line Items]
Proceeds from sale-lease back	$ 56
Area of real estate property | ft²	285,337
Number of states the buildings are located | state	3
Number of medical office buildings divested | item	4
Medical Equipment [Member]
Capital Leased Assets [Line Items]
Operating lease right-of-use asset			$ 31