Derivatives - Derivative Assets And Collateral Received (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Gross amounts of recognized assets	$ 323	$ 765
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Statements of Condition	323	765
Derivative liabilities available for offset	(36)	(21)
Collateral received	(184)	(347)
Net amount	103	397
Derivative assets not subject to master netting agreements	2	4
Derivatives, interest rate contracts
Derivative [Line Items]
Gross amounts of recognized assets	311	702
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Statements of Condition	311	702
Derivative liabilities available for offset	(32)	(7)
Collateral received	(181)	(327)
Net amount	98	368
Forward contracts
Derivative [Line Items]
Gross amounts of recognized assets	12	63
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Statements of Condition	12	63
Derivative liabilities available for offset	(4)	(14)
Collateral received	(3)	(20)
Net amount	$ 5	$ 29