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, 2020	$ 13,598	$ 0	$ 0	$ 8,642	$ (1,309)	$ 6,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,789					3,789
Other comprehensive income (loss)	36				36
Stock-based compensation	50			50
Dividends paid (Note 11)	(3,620)					(3,620)
Dividends declared on preferred stock (Note 11)	(59)					(59)
Balance at end of period at Dec. 31, 2021	13,794	0	0	8,692	(1,273)	6,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,084					3,084
Other comprehensive income (loss)	(100)				(100)
Stock-based compensation	49			49
Dividends paid (Note 11)	(1,759)					(1,759)
Dividends declared on preferred stock (Note 11)	(59)					(59)
Balance at end 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)	2,245					2,245
Other comprehensive income (loss)	165				165
Stock-based compensation	41			41
Dividends paid (Note 11)	(1,859)					(1,859)
Dividends declared on preferred stock (Note 11)	(59)					(59)
Balance at end of period at Dec. 31, 2023	$ 15,542	$ 0	$ 0	$ 8,783	$ (1,208)	$ 7,967