SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator
Net income (loss)	$ 2,517	$ 597	$ 1,379
Less:  dividends declared-common shares and unvested common shares	(288)	(255)	(247)
Undistributed earnings, basic	2,229	342	1,132
Undistributed earnings, diluted	$ 2,229	$ 342	$ 1,132
Percentage allocated to common shareholders	98.80%	98.70%	98.70%
Net income (loss) available to common stockholders, basic before dividends, common stock	$ 2,203	$ 337	$ 1,117
Net income (loss) available to common stockholders, diluted before dividends, common stock	2,203	337	1,117
Add:  dividends declared-common shareholders	285	252	244
Numerator for basic earnings per common share	2,488	589	1,361
Numerator for diluted earnings per common share	$ 2,488	$ 589	$ 1,361
Denominator
Denominator for basic earnings per weighted-average common shares	41.3	38.8	39.3
Effect of dilutive securities:
Options	0.0	0.0	0.0
Denominator for diluted earnings per adjusted weighted-average common shares	41.3	38.8	39.3
Per common share net income (loss)
Basic (in dollars per share)	$ 60.19	$ 15.19	$ 34.66
Diluted (in dollars per share)	$ 60.19	$ 15.19	$ 34.62
Basic weighted-average common shares outstanding	41.3	38.8	39.3
Basic weighted-average common shares outstanding and unvested common shares expected to vest	41.8	39.3	39.8