Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative, Net	$ (5,731)	$ (3,351)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	21
Credit Default Swaps Referencing Indices, Sell Protection
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	144	47
Credit Risk Derivatives, at Fair Value, Net Asset	1	$ 0
Credit Default Swaps Referencing Indices, Sell Protection | NAIC 3
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	42
Credit Default Swaps Referencing Indices, Sell Protection | NAIC 6
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	$ 102