Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Asset Derivatives	$ 57	$ 62
Derivative assets	(45)	34
Gross Amounts of Recognized (Liabilities)	(72)	(15)
Derivative Liability	30	13
Other liabilities
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash	32	21
Gross Amounts of Recognized (Liabilities)	(72)	(15)
Gross Amounts Offset in the Statement of Financial Position, liabilities	(70)	(7)
Derivative Liability	30	13
Derivative, Collateral, Obligation to Return Cash	(32)	(21)
Financial Collateral (Received)	(1)	(7)
Net amount, liabilities	(1)	(1)
Other investments
Derivative [Line Items]
Asset Derivatives	57	62
Gross Amounts Offset in the Statement of Financial Position, assets	53	60
Derivative assets	(45)	34
Derivative, Collateral, Obligation to Return Cash	(49)	32
Financial Collateral Pledged	0	0
Net Amount, assets	4	2
Derivative, Collateral, Obligation to Return Cash	$ 49	$ (32)