SIGNIFICANT ACCOUNTING POLICIES - Accounting and Consolidation of Variable Interest Entities (VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 267,807	$ 251,294
Investments	96,680	102,195
Consolidated Limited Partnerships
Variable Interest Entity [Line Items]
Assets	169	12
Non-consolidated Vairable Interest Entities
Variable Interest Entity [Line Items]
Assets	245,700	165,800
Investments	2,100	1,300
Variable interest, maximum loss exposure	2,100	1,300
Unfunded commitments	$ 1,200	$ 1,200