Derivative and Hedging Activities - Schedule of Derivative Subject to a Master Netting Agreement, Including the Cash Pledged as Collateral (Details) $ in Millions	Dec. 31, 2022 USD ($)
Designated as Hedging Instrument | Interest Rate Swaps on FHLB Advances
Derivative [Line Items]
Gross Amount	$ 5	[1]
Net Amount Presented in the Statements of Financial Condition	5	[1]
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments	4	[1]
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged	27	[1]
Derivatives Not Designated as Hedging Instruments
Assets
Gross Amount	220
Net Amount Presented in the Statements of Financial Condition	220
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged (Received)	(44)
Liabilities
Gross Amount	126
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments	126
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged (Received)	83
Derivatives Not Designated as Hedging Instruments | Mortgage-backed Securities Forwards
Assets
Gross Amount	36
Net Amount Presented in the Statements of Financial Condition	36
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged (Received)	(9)
Liabilities
Gross Amount	61
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments	61
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged (Received)	54
Derivatives Not Designated as Hedging Instruments | Interest Rate Swaptions
Assets
Gross Amount	182
Net Amount Presented in the Statements of Financial Condition	182
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged (Received)	(36)
Derivatives Not Designated as Hedging Instruments | Futures
Assets
Gross Amount	2
Net Amount Presented in the Statements of Financial Condition	2
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged (Received)	1
Derivatives Not Designated as Hedging Instruments | Interest Rate Swap
Liabilities
Gross Amount	65	[2]
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments	65	[2]
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Pledged (Received)	$ 29	[2]

[1] Notional value of cash flow hedging instruments at December 31, 2021 $2.3 billion. Securities pledged at December 31, 2021 was $9 million.

[2] Variation margin pledged to, or received from, a Central Counterparty Clearing House to cover the prior days fair value of open positions is considered settlement of the derivative position for accounting purposes.