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, 2019	$ 12,726	$ 0	$ 0	$ 8,101	$ (1,119)	$ 5,744
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,009					2,009
Other comprehensive income (loss)	(190)				(190)
Stock-based compensation	49			49
Dividends paid (Note 11)	(845)					(845)
Issuance of preferred stock (Note 11)	492			492
Balance at end 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