Consolidated Statement Of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Issuance of common stock (in shares)	109,621,000	185,020,000	274,177,000
Repurchases of common stock (in shares)	402,570		402,570,000
Special cash dividend, per share	$ 2.80	$ 2.55	$ 2.35