Stockholders' Equity and EPS - Preferred Stock Summary (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares	May 13, 2021 $ / shares	Feb. 02, 2021 $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 09, 2019 $ / shares
Class of Stock [Line Items]
Carrying value | $	$ 2,064			$ 340
Shares issued and outstanding | shares	367,500			350,000
Par Value	$ 0.001			$ 0.001
Preferred Stock, Series A
Class of Stock [Line Items]
Amount outstanding | $	$ 350
Carrying value | $	$ 340
Shares issued and outstanding | shares	350,000
Par Value	$ 0.001				$ 0.001
Preferred stock, depository share ownership interest	0.025
Preferred stock, liquidation preference per depositary share					$ 25
2021 dividends paid per depository share, usd per share	$ 0.98
Series B Preferred Stock
Class of Stock [Line Items]
Amount outstanding | $	$ 750
Carrying value | $	$ 739
Shares issued and outstanding | shares	7,500
Par Value	$ 0.001		$ 0.001
Preferred stock, depository share ownership interest	0.01
Preferred stock, liquidation preference per depositary share			1,000
2021 dividends paid per depository share, usd per share	$ 21.98
Series C Preferred Stock
Class of Stock [Line Items]
Amount outstanding | $	$ 1,000
Carrying value | $	$ 985
Shares issued and outstanding | shares	10,000
Par Value	$ 0.001	$ 0.001
Preferred stock, depository share ownership interest	0.01
Preferred stock, liquidation preference per depositary share		$ 1,000	$ 1,000
2021 dividends paid per depository share, usd per share	$ 10.22