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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 ($)
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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.

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