Stockholders' Equity - Repurchase Program (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Oct. 22, 2020
Class of Stock [Line Items]
Shares repurchased	$ 170,382,000	$ 530,237,000
Program
Class of Stock [Line Items]
Shares repurchased (in shares)	15,257,675
Shares repurchased	$ 3,300,000,000
Program | Common Stock
Class of Stock [Line Items]
Increase in authorized amount to be repurchased			$ 1,000,000,000
Stock repurchase program, approved amount			$ 4,100,000,000
Remaining authorized repurchase amount	$ 836,300,000