Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Asset Derivatives	$ 30	$ 17
Derivative assets	8	7
Gross Amounts of Recognized (Liabilities)	(44)	(59)
Derivative Liability	(22)	(49)
Derivative, Collateral, Right to Reclaim Cash	1	2
Other liabilities
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash	9	0
Gross Amounts of Recognized (Liabilities)	(44)	(59)
Gross Amounts Offset in the Statement of Financial Position, liabilities	(13)	(10)
Derivative Liability	(22)	(49)
Derivative, Collateral, Obligation to Return Cash	(9)	0
Financial Collateral (Received)	(28)	(47)
Net amount, liabilities	(3)	(2)
Other investments
Derivative [Line Items]
Asset Derivatives	30	17
Gross Amounts Offset in the Statement of Financial Position, assets	22	13
Derivative assets	8	7
Derivative, Collateral, Obligation to Return Cash	0	3
Financial Collateral Pledged	6	4
Net Amount, assets	2	0
Derivative, Collateral, Obligation to Return Cash	$ 0	$ (3)