Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Millions		9 Months Ended		12 Months Ended
		Sep. 30, 2022		Dec. 31, 2021
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (44)		$ 28
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 1,723		$ 1,321
Derivative Average Remaining Maturity	[1],[3]	9 years 4 months 24 days		9 years
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (40)		$ 28
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 433		$ 600
Derivative Average Remaining Maturity	[1],[3]	18 years 9 months 18 days		14 years 2 months 12 days
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (40)		$ 28
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 433		$ 600
Derivative Average Remaining Maturity	[1],[3]	18 years 9 months 18 days		14 years 2 months 12 days
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ 0		$ 1
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 150		$ 141
Derivative Average Remaining Maturity	[1],[3]	3 years 7 months 6 days		2 years 4 months 24 days
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (1)		$ 0
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 1,115		$ 565
Derivative Average Remaining Maturity	[1],[3]	6 years 8 months 12 days		5 years 1 month 6 days
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (1)		$ 1
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 1,265		$ 706
Derivative Average Remaining Maturity	[1],[3]	6 years 3 months 18 days		4 years 7 months 6 days
Standard & Poor's, BB Rating [Member]
Credit Derivatives [Line Items]
Derivative Average Remaining Maturity	[1]	3 years 4 months 24 days	[3]	3 years 6 months	[2]
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	$ (3)		$ (1)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	25		15
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member]
Credit Derivatives [Line Items]
Credit Derivative Current Fair Value	[1]	(3)		(1)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 25		$ 15

[1] The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).

[2] Assumes the value of the referenced credit obligations is zero.

[3] The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.