SIGNIFICANT ACCOUNTING POLICIES - Accounting and Consolidation of Variable Interest Entities (VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Assets	$ 253,330	$ 267,807
Investments	90,540	96,680
Consolidated Limited Partnerships
Variable Interest Entity [Line Items]
Assets	222	169
Non-consolidated Vairable Interest Entities
Variable Interest Entity [Line Items]
Assets	259,100	245,700
Investments	2,200	2,100
Variable interest, maximum loss exposure	2,200	2,100
Unfunded commitments	$ 1,200	$ 1,200