Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 899	$ 929
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	899	929
Derivative assets  available for offset	(77)	(64)
Collateral pledged	(199)	(176)
Net amount	623	689
Derivative liabilities not subject to master netting agreements	34	29
Interest rate derivative contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	895	921
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	895	921
Derivative assets  available for offset	(75)	(58)
Collateral pledged	(198)	(175)
Net amount	622	688
Forward contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	4	8
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	4	8
Derivative assets  available for offset	(2)	(6)
Collateral pledged	(1)	(1)
Net amount	$ 1	$ 1