Schedule IV Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Net Amount	$ 31,259	$ 28,523	$ 30,561
Reportable Segments
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Percent of Amount Assumed to Net	28.50%	24.70%	21.70%
Direct	$ 34,875	$ 32,977	$ 34,380
Ceded to Other Companies	12,521	11,496	10,442
Assumed from Other Companies	8,905	7,042	6,623
Net Amount	$ 31,259	$ 28,523	$ 30,561
Reportable Segments | General Insurance Companies
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Percent of Amount Assumed to Net	25.90%	24.80%	23.80%
Direct	$ 30,279	$ 28,596	$ 30,017
Ceded to Other Companies	11,301	10,435	9,526
Assumed from Other Companies	6,640	5,984	6,395
Net Amount	$ 25,618	$ 24,145	$ 26,886
Reportable Segments | Life and Retirement Companies
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Percent of Amount Assumed to Net	40.20%	24.20%	6.20%
Direct	$ 4,596	$ 4,381	$ 4,363
Ceded to Other Companies	1,220	1,061	916
Assumed from Other Companies	2,265	1,058	228
Net Amount	$ 5,641	$ 4,378	$ 3,675
Long-duration insurance in force
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Percent of Amount Assumed to Net	0.00%	0.00%	0.00%
Direct	$ 1,280,090	$ 1,243,389	$ 1,185,771
Ceded to Other Companies	363,008	349,453	264,732
Assumed from Other Companies	192	225	279
Net Amount	$ 917,274	894,161	$ 921,318
Long-duration insurance in force | As Previously Reported
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Ceded to Other Companies		292,500
Net Amount		$ 951,100