Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative, Net	$ (9,358)	$ (7,402)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	22
Credit Default Swaps Referencing Indices, Sell Protection
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	616	643
Credit Risk Derivatives, at Fair Value, Net Asset	11	$ 8
Credit Default Swaps Referencing Indices, Sell Protection | NAIC 3
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	522
Credit Default Swaps Referencing Indices, Sell Protection | NAIC 6
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	$ 94