Schedule I Condensed Financial Statements (Parent Company Only) - Condensed Balance Sheets (Parenthetical) (Details) - $ / shares shares in Millions	Dec. 31, 2021	Dec. 31, 2020
Condensed Balance Sheet Statements, Captions [Line Items]
Preferred stock, shares authorized	100	100
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares outstanding	2	4
Preferred stock, shares issued	2	4
Common stock, shares authorized	115	115
Common stock, shares issued	76	76
Common stock, shares outstanding	76	76
Parent Company
Condensed Balance Sheet Statements, Captions [Line Items]
Preferred stock, shares authorized	100	100
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares outstanding	2	4
Preferred stock, shares issued	2	4
Common stock, shares authorized	115	115
Common stock, shares issued	76	76
Common stock, shares outstanding	76	76