Derivatives - Derivative Assets and Collateral Received (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross amounts of recognized assets	$ 546	$ 458
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Balance Sheets	546	458
Derivative liabilities available for offset	(52)	(64)
Collateral received	(483)	(380)
Net amount	11	14
Derivative assets not subject to master netting agreements	2	2
Interest rate derivative contracts
Derivative [Line Items]
Gross amounts of recognized assets	535	449
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Balance Sheets	535	449
Derivative liabilities available for offset	(45)	(58)
Collateral received	(481)	(378)
Net amount	9	13
Forward contracts
Derivative [Line Items]
Gross amounts of recognized assets	11	9
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Balance Sheets	11	9
Derivative liabilities available for offset	(7)	(6)
Collateral received	(2)	(2)
Net amount	$ 2	$ 1