Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Restricted cash and equivalents, in default funds and margin deposits	$ 254	$ 3,120
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	900,000,000	900,000,000
Common stock, shares issued (in shares)	587,518,685	594,620,320
Common stock, shares outstanding (in shares)	561,990,385	569,894,024
Common stock in treasury (in shares)	25,528,300	24,726,296