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Debt - Holding Company Debt (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 28, 2022	Apr. 30, 2021	Jan. 31, 2021
Holding Company
Debt Instrument [Line Items]
Extinguishment of debt, amount		$ 57
Repurchase amount	$ 92	92		$ 92
Gain (loss) on extinguishment of debt				13	$ (2)	$ 3
Holding Company \| 4.750% senior unsecured notes due 2024
Debt Instrument [Line Items]
Debt face amount	$ 35	$ 35		$ 35				$ 455
Interest rate on debt instrument	4.75%	4.75%		4.75%
Holding Company \| 5.875% senior unsecured notes due 2022
Debt Instrument [Line Items]
Debt face amount								$ 1,100
Interest rate on debt instrument								6.25%
Holding Company \| 6.250% senior unsecured notes due 2022
Debt Instrument [Line Items]
Debt face amount	$ 12	$ 12		$ 12					$ 750
Interest rate on debt instrument	6.25%	6.25%		6.25%					6.25%
Holding Company \| 6.375% senior unsecured notes due 2025
Debt Instrument [Line Items]
Interest rate on debt instrument	6.375%	6.375%		6.375%
Holding Company \| 5.250% senior unsecured notes due 2027
Debt Instrument [Line Items]
Debt face amount	$ 5	$ 5		$ 5
Interest rate on debt instrument	5.25%	5.25%		5.25%
Holding Company \| 6.250% senior unsecured notes due 2026
Debt Instrument [Line Items]
Interest rate on debt instrument	6.25%	6.25%		6.25%
Holding Company \| 6.750% senior unsecured notes due 2024
Debt Instrument [Line Items]
Debt face amount							$ 500
Interest rate on debt instrument							6.75%
Gain (loss) on extinguishment of debt					$ (1)
Holding Company \| 4.375% senior unsecured notes due 2029
Debt Instrument [Line Items]
Debt face amount	$ 40	$ 40		$ 40					$ 750
Interest rate on debt instrument	4.375%	4.375%		4.375%					4.375%
Repurchase amount	$ 84	$ 84		$ 84
Holding Company \| 9.750% senior unsecured notes due 2029
Debt Instrument [Line Items]
Debt face amount	$ 700	$ 700		$ 700
Interest rate on debt instrument	9.75%	9.75%		9.75%
Holding Company \| Cash and cash equivalents \| 4.750% senior unsecured notes due 2024
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 376
Energy \| Subsequent event
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			$ (1)