Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Asset Derivatives	$ 17	$ 33
Derivative assets	7	23
Gross Amounts of Recognized (Liabilities)	(59)	(94)
Derivative liabilities	(49)	(84)
Derivative Liabilities
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash	0	(4)
Gross Amounts of Recognized (Liabilities)	(59)	(94)
Gross Amounts Offset in the Statement of Financial Position, liabilities	(10)	(6)
Derivative liabilities	(49)	(84)
Financial Collateral (Received)	(47)	(83)
Net amount, liabilities	(2)	(5)
Derivative Assets
Derivative [Line Items]
Asset Derivatives	17	33
Gross Amounts Offset in the Statement of Financial Position, assets	13	31
Derivative assets	7	23
Derivative, Collateral, Obligation to Return Cash	(3)	(21)
Financial Collateral Pledged	4	1
Net Amount, assets	$ 0	$ 1