Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 1,076	$ 929
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	1,076	929
Derivative assets  available for offset	(100)	(64)
Collateral pledged	(239)	(176)
Net amount	737	689
Derivative liabilities not subject to master netting agreements	27	29
Interest rate derivative contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	1,068	921
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	1,068	921
Derivative assets  available for offset	(96)	(58)
Collateral pledged	(238)	(175)
Net amount	734	688
Forward contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	8	8
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	8	8
Derivative assets  available for offset	(4)	(6)
Collateral pledged	(1)	(1)
Net amount	$ 3	$ 1