SCHEDULE IV - REINSURANCE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Life insurance in force
Life insurance in force, Gross amount	$ 107,014	$ 113,202	$ 114,354
Life insurance in force, Ceded to other companies	75,159	83,166	89,603
Life insurance in force, Assumed from other companies	284,518	301,316	321,331
Life insurance in force, Net amount	$ 316,373	$ 331,352	$ 346,082
Life insurance in force, Percentage of amount assumed to net	89.90%	90.90%	92.80%
Premiums and contract charges:
Premiums and contract charges, Goss amount	$ 748	$ 743	$ 734
Premiums and contract charges, Ceded to other companies	319	326	340
Premiums and contract charges, Assumed from other companies	930	982	999
Premiums and contract charges, Net amount	$ 1,359	$ 1,399	$ 1,393
Premiums and contract charges, Percentage of amount assumed to net	68.40%	70.20%	71.70%
Reinsurance or coinsurance income netted against premiums ceded	$ 0	$ 0	$ 0
Life insurance
Premiums and contract charges:
Premiums and contract charges, Goss amount	683	679	677
Premiums and contract charges, Ceded to other companies	302	308	320
Premiums and contract charges, Assumed from other companies	858	906	925
Premiums and contract charges, Net amount	$ 1,239	$ 1,277	$ 1,282
Premiums and contract charges, Percentage of amount assumed to net	69.20%	70.90%	72.20%
Accident and health insurance
Premiums and contract charges:
Premiums and contract charges, Goss amount	$ 65	$ 64	$ 57
Premiums and contract charges, Ceded to other companies	17	18	20
Premiums and contract charges, Assumed from other companies	72	76	74
Premiums and contract charges, Net amount	$ 120	$ 122	$ 111
Premiums and contract charges, Percentage of amount assumed to net	60.00%	62.30%	66.70%