Reinsurance (Effect of Reinsurance on Life Insurance In Force) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reinsurance Disclosures [Abstract]
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount	$ 1,027	$ 1,117	$ 1,990
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies	3,400,735	3,467,054	3,480,692
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies	151,569	166,842	184,625
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount	$ 3,250,193	$ 3,301,329	$ 3,298,057
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net	104.60%	105.00%	105.50%