Schedule IV — Reinsurance (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Life insurance in force
Gross amount	$ 21,271,000,000	$ 20,535,000,000	$ 17,124,000,000
Ceded to other companies	614,000,000	640,000,000	16,528,000,000
Assumed from other companies	1,401,000,000	1,528,000,000	1,003,000,000
Net amount	$ 22,058,000,000	$ 21,423,000,000	$ 1,599,000,000
Percentage of amount assumed to net	6.40%	7.10%	62.70%
Premiums and contract charges:
Gross amount	$ 49,392,000,000	$ 45,822,000,000	$ 39,208,000,000
Ceded to other companies	1,907,000,000	1,982,000,000	1,154,000,000
Assumed from other companies	252,000,000	199,000,000	113,000,000
Net amount	$ 47,737,000,000	$ 44,039,000,000	$ 38,167,000,000
Percentage of amount assumed to net	0.50%	0.50%	0.30%
Reinsurance or coinsurance income netted against premium ceded	$ 0	$ 0	$ 0
Life insurance
Premiums and contract charges:
Gross amount	218,000,000	156,000,000	162,000,000
Ceded to other companies	7,000,000	6,000,000	8,000,000
Assumed from other companies	17,000,000	15,000,000	14,000,000
Net amount	$ 228,000,000	$ 165,000,000	$ 168,000,000
Percentage of amount assumed to net	7.50%	9.10%	8.30%
Accident and health insurance
Premiums and contract charges:
Gross amount	$ 1,622,000,000	$ 1,722,000,000	$ 931,000,000
Ceded to other companies	31,000,000	72,000,000	5,000,000
Assumed from other companies	14,000,000	6,000,000	0
Net amount	$ 1,605,000,000	$ 1,656,000,000	$ 926,000,000
Percentage of amount assumed to net	0.90%	0.40%	0.00%
Property and casualty insurance
Premiums and contract charges:
Gross amount	$ 47,552,000,000	$ 43,944,000,000	$ 38,115,000,000
Ceded to other companies	1,869,000,000	1,904,000,000	1,141,000,000
Assumed from other companies	221,000,000	178,000,000	99,000,000
Net amount	$ 45,904,000,000	$ 42,218,000,000	$ 37,073,000,000
Percentage of amount assumed to net	0.50%	0.40%	0.30%