Stock Repurchase Program, Additional Authorized Amount

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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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Amount of stock repurchase plan authorized.

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No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stockholders' Deficit - Repurchase of Common Stock (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	May 02, 2018	Mar. 31, 2017	Jul. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Value of shares repurchased	$ 17,700,000	$ 324,700,000
July 2015 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,500,000,000
Stock repurchase program, authorized increase			$ 1,000,000,000.0	$ 1,500,000,000.0
Number of shares repurchased (in shares)	406,586	8,794,954
Value of shares repurchased	$ 17,700,000	$ 404,700,000
Shares acquired, average price per share (in usd per share)	$ 43.41
Common Stock \| July 2015 Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)		7,575,318
Value of shares repurchased		$ 324,700,000
Shares acquired, average price per share (in usd per share)		$ 42.86