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Variable Interest Entities, Number Of Subsidiaries That Own Buildings

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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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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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

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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		9 Months Ended
	Jul. 02, 2019	Apr. 30, 2019	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 building subsidiary
Variable Interest Entity [Line Items]
Equity method investments				$ 1,393,000,000		$ 1,393,000,000		$ 1,312,000,000
Limited guarantee				50,000,000		50,000,000		50,000,000
Loss from equity method investment, net of tax				(9,000,000)	$ (15,000,000)	(25,000,000)	$ (32,000,000)
Event Center Office Partners, LLC
Variable Interest Entity [Line Items]
Impairment of equity method investments						0
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Percentage of ownership before sale of stock		100.00%
Assets				1,300,000,000		1,300,000,000		115,000,000
Liabilities				173,000,000		173,000,000		$ 0
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of office buildings managed \| building									2
Number of wholly owned subsidiaries owning buildings \| subsidiary									2
Variable Interest Entity, Not Primary Beneficiary \| Event Center Office Partners, LLC
Variable Interest Entity [Line Items]
Ownership interest			45.00%
Payments to acquire variable interest entity			$ 136,000,000
Equity method investments				136,000,000		136,000,000
Limited guarantee				$ 50,000,000		$ 50,000,000
Variable Interest Entity, Not Primary Beneficiary \| LLC Partner One \| Event Center Office Partners, LLC
Variable Interest Entity [Line Items]
Ownership interest			45.00%
Variable Interest Entity, Not Primary Beneficiary \| LLC Partner Two \| Event Center Office Partners, LLC
Variable Interest Entity [Line Items]
Ownership interest			10.00%
Preferred Class A \| Softbank, Toyota, and DENSO \| ATG Investment
Variable Interest Entity [Line Items]
Sale of stock, percentage of ownership after transaction	13.80%