Schedule IV Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Life insurance in-force
Gross Amount	$ 879,496	$ 722,048	$ 700,860
Ceded Amount	18,483	16,674	9,493
Assumed From Other Companies	254,739	442,817	301,573
Net Amount	$ 1,115,752	$ 1,148,191	$ 992,940
Percentage of Amount Assumed to Net	23.00%	39.00%	30.00%
Insurance revenues
Gross Amount	$ 16,132	$ 14,439	$ 14,204
Ceded Amount	1,027	660	650
Assumed From Other Companies	1,988	2,265	678
Premiums Earned, Net	$ 16,923	$ 15,869	$ 14,141
Percentage of Amount Assumed to Net	12.00%	14.00%	5.00%
Property and Casualty Insurance Products
Insurance revenues
Gross Amount	$ 12,010	$ 10,824	$ 10,923
Ceded Amount	936	599	600
Assumed From Other Companies	416	221	232
Premiums Earned, Net	$ 11,490	$ 10,446	$ 10,555
Percentage of Amount Assumed to Net	4.00%	2.00%	2.00%
Life insurance and annuities
Insurance revenues
Gross Amount	$ 1,739	$ 1,551	$ 1,526
Ceded Amount	25	22	14
Assumed From Other Companies	807	1,082	232
Premiums Earned, Net	$ 2,521	$ 2,611	$ 1,744
Percentage of Amount Assumed to Net	32.00%	41.00%	13.00%
Accident and health insurance
Insurance revenues
Gross Amount	$ 2,383	$ 2,064	$ 1,755
Ceded Amount	66	39	36
Assumed From Other Companies	765	962	214
Premiums Earned, Net	$ 3,082	$ 2,987	$ 1,933
Percentage of Amount Assumed to Net	25.00%	32.00%	11.00%
Earned premiums and fees [Member]
Insurance revenues
Premiums Earned, Net	$ 17,093	$ 16,044	$ 14,232