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Derivative Instruments (Open Credit Default Swap Liabilities) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Credit Default Swap, Seller [Member]
Summary Of Credit Derivatives
Maximum potential payout	$ 51	$ 55
Derivative Contract, Maturing 12-20-2025 [Member]
Summary Of Credit Derivatives
Maturity	Dec. 20, 2025
Credit rating of underlying obligation	BBB+
Number of instruments | item	1
Fair value	$ 1
Maximum potential payout	$ 51
Derivative Contract, Maturing 12-20-2024 [Member]
Summary Of Credit Derivatives
Maturity		Dec. 20, 2024
Credit rating of underlying obligation		BBB+
Number of instruments | item		1
Fair value		$ 1
Maximum potential payout		$ 55

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- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
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Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

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Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Date the derivative contract matures, in CCYY-MM-DD format.

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Number of credit risk derivative instruments held.

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