Commitments and Contingencies - Credit Enhancement Guarantee (Details) $ in Millions	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Third party debt collateralized by facilities, debt amount	$ 74
Third party debt collateralized by facilities, asset carrying amount	$ 351

The carrying value of facilities owned by the entity that are collateral for third party debt.

No definition available.

Name:	hcp_ThirdPartyDebtCollateralizedByFacilitiesAssetCarryingAmount
Namespace Prefix:	hcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant