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Variable Interest Entities, Number Of Subsidiaries That Own Buildings

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Variable Interest Entity, Nonconsolidated, Reporting Entity Involvement, Limited Guarantee

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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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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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Variable Interest Entities (VIEs) - Narrative (Details)	1 Months Ended	3 Months Ended
Variable Interest Entities (VIEs) - Narrative (Details)	Mar. 31, 2018 USD ($) building subsidiary	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($) building subsidiary	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Equity method investments		$ 1,320,000,000		$ 1,312,000,000
Limited guarantee		50,000,000		50,000,000
Loss from equity method investment, net of tax		(6,000,000)	$ (3,000,000)
Event Center Office Partners, LLC
Variable Interest Entity [Line Items]
Loss from equity method investment, net of tax		0
Impairment of equity method investments		0
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		119,000,000		$ 115,000,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of office buildings managed \| building	2		2
Number of wholly owned subsidiaries owning buildings \| subsidiary	2		2
Payments to acquire variable interest entity	$ 136,000,000
VIE, ownership percentage	45.00%
Equity method investments		136,000,000
Limited guarantee		$ 50,000,000
Variable Interest Entity, Not Primary Beneficiary \| LLC Partner One
Variable Interest Entity [Line Items]
VIE, ownership percentage	45.00%
Variable Interest Entity, Not Primary Beneficiary \| LLC Partner Two
Variable Interest Entity [Line Items]
VIE, ownership percentage	10.00%