Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 01, 2022	May 27, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 14, 2020	Jan. 25, 2013
Class of Stock [Line Items]
Preferred Stock, Shares Authorized			50,000,000	50,000,000
Preferred Stock, Shares Issued			10,062,500	10,062,500
Net proceeds from issuance of preferred stock in connection with public offering			$ 0	$ 975	$ 0
Payments of Dividends			$ 55	$ 28	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
Net proceeds from issuance of common stock in connection with public offering			$ 0	$ 975	0
Stock Repurchase Program, Authorized Amount						$ 1,000	$ 1,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			15,700,000
Payments for repurchase of common stock			$ 0	$ 535	$ 0
Treasury Stock, Shares			263,289,848	263,289,848
5.50% MCPS, Series A [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued		10,062,500
Preferred Stock, Dividend Rate, Percentage		5.50%
Preferred Stock, Liquidation Preference Per Share		$ 100	$ 100
Net proceeds from issuance of preferred stock in connection with public offering		$ 975
Preferred Stock, Liquidation Preference, Value			$ 1,006
Preferred Stock, Dividends, Per Share, Cash Paid			$ 1.3750
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, Cash Paid	$ 1.3750
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
Net proceeds from issuance of common stock in connection with public offering		$ 975