Preferred Stock (Details) $ / shares in Units, $ in Millions	Jul. 15, 2019 shares	Jul. 26, 2016 USD ($) trading_day $ / shares shares
Depository Shares [Member]
Class of Stock [Line Items]
Depository shares issued		5,200,000
Preferred stock ownership interest		0.01
6.75% Series B Mandatory Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Percentage of issued shares		6.75%
Offering price (in usd per share) | $ / shares		$ 100
Threshold trading days | trading_day		20
Proceeds from offering, net | $		$ 501
6.75% Series B Mandatory Convertible Preferred Stock [Member] | Scenario, Forecast [Member] | Minimum [Member]
Class of Stock [Line Items]
Preferred stock converted in to common stock (in shares)	120.46
Number of common stock issued upon conversion (in shares)	6,200,000
6.75% Series B Mandatory Convertible Preferred Stock [Member] | Scenario, Forecast [Member] | Maximum [Member]
Class of Stock [Line Items]
Preferred stock converted in to common stock (in shares)	132.50
Number of common stock issued upon conversion (in shares)	6,900,000