INCOME TAXES - Components of Net Deferred Income Tax Assets (Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Insurance company loss reserves	$ 3,185	$ 2,492
Progress collections, contract assets and deferred items	2,753	2,365
Accrued expenses and reserves	2,197	2,215
Deferred expenses	1,317	1,438
Other compensation and benefits	1,143	1,173
Principal pension plans	1,359	1,146
Non-U.S. loss carryforwards	972	939
Other	843	1,000
Total deferred tax assets	13,769	12,768
Deferred tax liabilities
Depreciation	(702)	(613)
Global investments, partnerships, join ventures and non-consolidated entities	(1,389)	(1,440)
Other	(1,103)	(714)
Total deferred tax liabilities	(3,194)	(2,767)
Net deferred income tax asset (liability)	10,575	10,001
Valuation allowances	6,932	6,369
Valuation allowances related to assets other than non-U.S. loss carryforwards	1,937	3,264
Net Operating Loss Carryforwards Expiring in Various Years Ending from 2022 Through 2024
Deferred tax assets
Non-U.S. loss carryforwards	73
Net Operating Loss Carryforwards Expiring in Various Years Ending from 2025 Through 2041
Deferred tax assets
Non-U.S. loss carryforwards	327
Net Operating Loss Carryforwards That May be Carried Forward Indefinitely
Deferred tax assets
Non-U.S. loss carryforwards	572
Net Capital Gains
Deferred tax liabilities
Deferred tax assets, valuation allowance	$ 1,413
Deductible Stock and Restructuring Losses
Deferred tax liabilities
Deferred tax assets, valuation allowance		$ 1,327