Schedule IV — Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Life insurance in force
Gross amount	$ 22,225	$ 21,788	$ 21,271
Ceded to other companies	295	482	614
Assumed from other companies	1,208	1,301	1,401
Net amount	$ 23,138	$ 22,607	$ 22,058
Percentage of amount assumed to net	5.20%	5.80%	6.40%
Premiums and contract charges:
Gross amount	$ 60,166	$ 54,166	$ 49,390
Ceded to other companies	2,260	2,036	1,906
Assumed from other companies	403	386	252
Net amount	$ 58,309	$ 52,516	$ 47,736
Percentage of amount assumed to net	0.70%	0.70%	0.50%
Life insurance
Premiums and contract charges:
Gross amount	$ 258	$ 226	$ 214
Ceded to other companies	5	6	6
Assumed from other companies	16	16	17
Net amount	$ 269	$ 236	$ 225
Percentage of amount assumed to net	5.90%	6.80%	7.60%
Accident and health insurance
Premiums and contract charges:
Gross amount	$ 1,687	$ 1,639	$ 1,624
Ceded to other companies	45	41	31
Assumed from other companies	10	12	14
Net amount	$ 1,652	$ 1,610	$ 1,607
Percentage of amount assumed to net	0.60%	0.70%	0.90%
Property and casualty insurance
Premiums and contract charges:
Gross amount	$ 58,221	$ 52,301	$ 47,552
Ceded to other companies	2,210	1,989	1,869
Assumed from other companies	377	358	221
Net amount	$ 56,388	$ 50,670	$ 45,904
Percentage of amount assumed to net	0.70%	0.70%	0.50%