Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 328,000,000	$ 321,000,000
Liability Fair Value	305,000,000	331,000,000
Counterparty netting, Assets	(277,000,000)	(263,000,000)
Counterparty netting, Liabilities	(277,000,000)	(263,000,000)
Cash collateral netting, Assets	(44,000,000)	(51,000,000)
Cash collateral netting, Liabilities	(19,000,000)	(64,000,000)
Securities collateral netting, Assets	(6,000,000)	(6,000,000)
Securities collateral netting, Liabilities	(9,000,000)	(1,000,000)
Net receivables	1,000,000	1,000,000
Net payables	0	3,000,000
excluded Liability Exchange Traded Contracts		0
Excluded assets exchange traded contract	$ 0	$ 1

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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[Line Items] for Offsetting Assets and Liabilities [Table]

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