Derivatives and Hedging (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative, Net	$ (17,025)	$ (11,968)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	35
Credit Default Swaps Referencing Indices, Sell Protection
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	850	912
Credit Risk Derivatives, at Fair Value, Net Asset	8	$ 10
Credit Default Swaps Referencing Indices, Sell Protection | NAIC 3
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	820
Credit Default Swaps Referencing Indices, Sell Protection | NAIC 6
Derivative [Line Items]
Credit Derivative, Maximum Exposure, Undiscounted	$ 30