Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 795	$ 675
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	795	675
Derivative assets  available for offset	(78)	(79)
Collateral pledged	(39)	(169)
Net amount	678	427
Derivative liabilities not subject to master netting agreements	21	24
Interest rate derivative contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	791	666
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	791	666
Derivative assets  available for offset	(76)	(75)
Collateral pledged	(38)	(164)
Net amount	677	427
Forward contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	4	9
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	4	9
Derivative assets  available for offset	(2)	(4)
Collateral pledged	(1)	(5)
Net amount	$ 1	$ 0