Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2025	Mar. 31, 2025	Mar. 31, 2024
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	13.6
Sale of stock, price per share (in dollars per share)	$ 11.00
Sale of stock, consideration received on transaction	$ 150
Common stock share value		$ 142	$ 228
Third Stock Purchase Agreement Amendment
Class of Stock [Line Items]
Contract with customer, asset, before allowance for credit loss			228
Capitalized contract cost, gross			$ 5
Gilead
Class of Stock [Line Items]
Sale of stock, consideration received on transaction		$ 15
Gilead | Third Stock Purchase Agreement Amendment
Class of Stock [Line Items]
Common stock shares issued (in shares)			15.2
Shares issued, price per share (in dollars per share)			$ 21.00
Common stock share value			$ 320
Premiums earned, net			$ 87
Gilead
Class of Stock [Line Items]
Sale of stock, number of shares acquired in transaction (in shares)		1.4