DERIVATIVES - Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative assets
Fair value derivative assets, including embedded derivative	$ 1,453,496	$ 258,237
Derivative liabilities
Fair value derivative liabilities, including embedded derivative	2,745,935	678,678
Asset Management
Derivative assets
Gross amount recognized	244,527	258,237
Derivative liabilities
Gross amount recognized	626,317	678,678
Fair value derivative liabilities	40,094	126,950
Asset Management \| Foreign Exchange Contracts and Options, and Foreign currency contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value	11,230,544	9,837,178
Derivative assets
Gross amount recognized	242,615	250,398
Derivative liabilities
Gross amount recognized	586,223	551,728
Asset Management \| Other Derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value	1,371,561	802,988
Derivative assets
Gross amount recognized	1,912	7,839
Derivative liabilities
Gross amount recognized	40,094	126,950
Insurance
Derivative assets
Gross amount recognized	1,331,547
Impact of netting	(201,028)
Fair value derivative assets	1,130,519
Embedded derivative	0
Fair value derivative assets, including embedded derivative	1,208,969
Derivative liabilities
Gross amount recognized	248,864
Impact of netting	(201,218)
Fair value derivative liabilities	47,646	$ 0
Embedded derivative	2,016,800
Fair value derivative liabilities, including embedded derivative	2,119,618
Insurance \| Embedded derivative – indexed universal life products
Derivative assets
Embedded derivative	0
Derivative liabilities
Embedded derivative	495,353
Insurance \| Embedded derivative – annuity products
Derivative assets
Embedded derivative	0
Derivative liabilities
Embedded derivative	1,521,447
Insurance \| Embedded derivative – funds withheld at interest
Derivative assets
Embedded derivative	78,450
Derivative liabilities
Embedded derivative	55,172
Insurance \| Foreign Exchange Contracts and Options, and Foreign currency contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value	450,546
Derivative assets
Gross amount recognized	6,412
Derivative liabilities
Gross amount recognized	2,550
Insurance \| Equity market contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value	28,345,670
Derivative assets
Gross amount recognized	1,126,504
Derivative liabilities
Gross amount recognized	177,667
Insurance \| Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value	8,833,113
Derivative assets
Gross amount recognized	198,631
Derivative liabilities
Gross amount recognized	67,092
Insurance \| Credit risk contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional value	60,000
Derivative assets
Gross amount recognized	0
Derivative liabilities
Gross amount recognized	$ 1,555

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