Derivative Instruments (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 41,000,000
Embedded Derivative, Fair Value of Embedded Derivative, Net Liability	(11,968,000,000)	$ (7,505,000,000)
Credit derivatives exposure on purchased credit protection	0	0
Credit Default Swap, Selling Protection
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	912,000,000	643,000,000
Credit Risk Derivatives, at Fair Value, Net Asset (Liability) (less than)	10,000,000	$ 8,000,000
Credit Default Swap, Selling Protection | NAIC 3
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	877,000,000
Credit Default Swap, Selling Protection | NAIC 6
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	$ 35,000,000