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, 2022	15,010	0	0	8,742	(1,373)	7,641
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,155
Other comprehensive income (loss)	60
Balance at end of period at Jun. 30, 2023	15,284	0	0	8,760	(1,312)	7,837
Balance at beginning of period at Mar. 31, 2023	15,201	0	0	8,749	(1,323)	7,775
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	571					571
Other comprehensive income (loss)	11				11
Stock-based compensation	11			11
Dividends paid (Note 10)	(450)					(450)
Dividends declared on preferred stock (Note 10)	(59)					(59)
Balance at end of period at Jun. 30, 2023	15,284	0	0	8,760	(1,312)	7,837
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
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)	1,147
Other comprehensive income (loss)	(207)
Balance at end of period at Jun. 30, 2024	15,538	0	0	8,797	(1,414)	8,155
Balance at beginning of period at Mar. 31, 2024	15,596	0	0	8,789	(1,246)	8,054
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	610					610
Other comprehensive income (loss)	(168)				(168)
Stock-based compensation	8			8
Dividends paid (Note 10)	(450)					(450)
Dividends declared on preferred stock (Note 10)	(59)					(59)
Balance at end of period at Jun. 30, 2024	$ 15,538	$ 0	$ 0	$ 8,797	$ (1,414)	$ 8,155