Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 6
Credit Default Swaps Referencing Indices, Sell Protection
Credit Derivatives
Credit Derivative, Maximum Exposure, Undiscounted	75	$ 1,746
Credit Risk Derivatives, at Fair Value, Net	4	$ 48
Credit Default Swaps Referencing Indices, Sell Protection | NAIC 3
Credit Derivatives
Credit Derivative, Maximum Exposure, Undiscounted	$ 75