Reinsurance (Effect of Reinsurance on Life Insurance In Force) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Disclosures [Abstract]
Reinsurance Premiums for Insurance Companies, by Product Segment, Gross Amount	$ 1,117	$ 1,990	$ 1,316
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Assumed from Other Companies	3,467,054	3,480,692	3,480,206
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies	166,842	184,625	192,864
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount	$ 3,301,329	$ 3,298,057	$ 3,288,658
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net	105.00%	105.50%	105.80%