Derivative Financial Instruments - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) counterparty	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Number of central counterparties | counterparty	2
Notional value	$ 1,906,092,000	$ 2,842,846,000
Derivative, fair value, amount offset against collateral, net	9,000,000	12,000,000
Gain (loss) to be reclassified within 12 months	(36,000,000)
Cash collateral held relative to derivative exposure	0	0
Cash collateral pledged	9,000,000	$ 11,000,000
CME
Derivative [Line Items]
Notional value	$ 1,800,000,000
Percent of total notional derivative contracts	92.60%
Amount of variation margin included as settlement	$ (40,000,000)
LCH
Derivative [Line Items]
Notional value	$ 100,000,000
Percent of total notional derivative contracts	7.40%
Amount of variation margin included as settlement	$ (4,000,000)