Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended	9 Months Ended
	Oct. 27, 2020	Sep. 01, 2020	May 27, 2020	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Preferred Stock, Shares Authorized					50,000,000		50,000,000
Preferred Stock, Shares Issued					10,062,500
Net proceeds from issuance of preferred stock in connection with public offering					$ 975	$ 0
Payments of Dividends					$ 14	0
Common Stock, Shares Authorized					2,000,000,000		2,000,000,000
Common Stock, Par or Stated Value Per Share					$ 0.01		$ 0.01
Proceeds from Issuance of Common Stock					$ 975	$ 0
5.50% MCPS, Series A [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued			10,062,500
Net proceeds from issuance of preferred stock in connection with public offering			$ 975
Preferred Stock, Dividend Rate, Percentage				5.50%
Preferred Stock, Liquidation Preference Per Share			$ 100		$ 100
Preferred Stock, Liquidation Preference, Value					$ 1,006
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1.4361
Payments of Dividends		$ 14
5.50% MCPS, Series A [Member] | Minimum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Terms of Conversion					2.3834
5.50% MCPS, Series A [Member] | Maximum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Terms of Conversion					2.9197
5.50% MCPS, Series A [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 1.375
Dividends, Preferred Stock, Cash	$ 14
Dividends Payable	$ 5
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues			29,382,500
Shares Issued, Price Per Share			$ 34.25
Proceeds from Issuance of Common Stock			$ 975