Amount of other increase (decrease) in additional paid in capital (APIC).

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The cash inflow from the additional capital contribution to the entity.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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No definition available.

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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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No definition available.

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Number of new stock issued during the period.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Noncontrolling interest, future contribution percentage

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Share Repurchase, Average Price Per Share

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Proceeds from common stock	$ 2	$ 10	$ 672
Stock Repurchase Program, Authorized Amount	$ 400
Stock Repurchased During Period, Shares	5,700
Share Repurchase, Average Price Per Share	$ 10.16
Transaction costs related to partnerships	$ 6
Common Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Stock Issued During Period, Shares, New Issues			51,675
Proceeds from common stock			$ 670
Sale of Stock, Price Per Share			$ 12.97
Over-Allotment Option [Member] \| Common Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Stock Issued During Period, Shares, New Issues			6,675
Minimum
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Noncontrolling interest, future contribution percentage	80.00%
Maximum
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Noncontrolling interest, future contribution percentage	85.00%