CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Preferred Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at beginning of period at Dec. 31, 2022	$ 15,010	$ 0	$ 0	$ 8,742	$ (1,373)	$ 7,641
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	584					584
Other comprehensive income (loss)	49				49
Stock-based compensation	7			7
Dividends paid (Note 10)	(450)					(450)
Balance at end of period at Mar. 31, 2023	15,201	0	0	8,749	(1,323)	7,775
Balance at beginning of period at Dec. 31, 2023	15,542	0	0	8,783	(1,208)	7,967
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	536					536
Other comprehensive income (loss)	(39)				(39)
Stock-based compensation	6			6
Dividends paid (Note 10)	(450)					(450)
Balance at end of period at Mar. 31, 2024	$ 15,596	$ 0	$ 0	$ 8,789	$ (1,246)	$ 8,054