Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Credit Risk Derivatives, at Fair Value, Net	[1]	$ (2)	$ 4
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 2,661	$ 1,475
Derivative Average Remaining Maturity	[1],[3]	6 years 9 months 18 days	8 years 6 months
Standard & Poor's, BBB Rating [Member]
Credit Derivatives [Line Items]
Credit Risk Derivatives, at Fair Value, Net	[1]	$ 3	$ 3
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 2,236	$ 1,045
Derivative Average Remaining Maturity	[1],[3]	4 years 10 months 24 days	4 years 8 months 12 days
Single Name Credit Default Swaps [Member] | Standard Poors AAA To A Ratings [Member]
Credit Derivatives [Line Items]
Credit Risk Derivatives, at Fair Value, Net	[1]	$ (5)	$ 2
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 410	$ 420
Derivative Average Remaining Maturity	[1],[3]	17 years 6 months	18 years 1 month 6 days
Single Name Credit Default Swaps [Member] | Standard & Poor's, BBB Rating [Member]
Credit Derivatives [Line Items]
Credit Risk Derivatives, at Fair Value, Net	[1]	$ 3	$ 4
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 150	$ 165
Derivative Average Remaining Maturity	[1],[3]	2 years 3 months 18 days	2 years 9 months 18 days
Single Name Credit Default Swaps [Member] | Standard & Poor's, BB+ Rating [Member]
Credit Derivatives [Line Items]
Credit Risk Derivatives, at Fair Value, Net	[1]	$ 0	$ (1)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 5	$ 10
Derivative Average Remaining Maturity	[1],[3]	1 year 6 months	2 years 2 months 12 days
Single Name Credit Default Swaps [Member] | Standard & Poor's, B Rating
Credit Derivatives [Line Items]
Credit Risk Derivatives, at Fair Value, Net	[1]	$ 0	$ 0
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 10	$ 0
Derivative Average Remaining Maturity	[1],[3]	1 year 2 months 12 days	0 years
Credit Default Swaps Referencing Indices [Member] | Standard & Poor's, BBB Rating [Member]
Credit Derivatives [Line Items]
Credit Risk Derivatives, at Fair Value, Net	[1]	$ 0	$ (1)
Maximum Potential Future Exposure on Credit Risk Derivatives	[1],[2]	$ 2,086	$ 880
Derivative Average Remaining Maturity	[1],[3]	5 years 1 month 6 days	5 years

[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