Investments in Unconsolidated Affiliates - Additional Information (Details) $ in Millions	9 Months Ended
Sep. 30, 2019 USD ($) Affiliate	Dec. 31, 2018 USD ($)
Schedule Of Investments [Line Items]
Number of unconsolidated affiliates \| Affiliate	2
Debt	$ 815	$ 604
Investments in unconsolidated affiliates	$ 44	38
BRE Ace LLC
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage	25.00%
1776 Holding, LLC
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage	50.00%
BRE Ace LLC and 1776 Holding, LLC
Schedule Of Investments [Line Items]
Debt	$ 495	$ 490

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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