Policyholders' Liabilities (Future Policy Benefits) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]
Individual annuities and supplementary contracts	$ 740,941	$ 810,989
Other contract liabilities	9,090,720	13,268,236
Total future policy benefits	27,927,029	32,889,181
Domestic
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	18,095,368	17,167,209
Taiwan
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	$ 0	$ 1,642,747