Reinsurance (Effect of Reinsurance on Life Insurance In Force) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reinsurance Disclosures [Abstract]
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount	$ 863	$ 924	$ 1,027
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies	3,878,640	3,704,061	3,400,735
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies	71,887	69,242	151,569
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount	$ 3,807,616	$ 3,635,743	$ 3,250,193
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net	101.90%	101.90%	104.60%