Derivative and Hedging Activities - Narrative (Details)	Dec. 31, 2020 USD ($) counterparty derivative	Dec. 31, 2019 USD ($) derivative
Derivative [Line Items]
Cash collateral for borrowed securities	$ 0	$ 0
Gain (loss) included in accumulated other comprehensive income to net income (loss) during the next 12 months	$ (8,000,000)
Credit risk
Derivative [Line Items]
Number of counterparties in hedge facility \| counterparty	7
Designated as hedging instrument
Derivative [Line Items]
Number of derivative instruments \| derivative	0	0

Number of Counterparties

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- Definition

Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

+ References

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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-Topic 815
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- Definition

The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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