INVESTMENT OPERATIONS - Summary of Net Realized Investment and Derivative Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Realized gains (losses) - investments, net
Fixed maturities	$ 46	$ 46	$ 48
Equity securities	4	0	(3)
Other investments	20	45	9
Total realized gains (losses) - investments, net	70	91	54
Modco trading portfolio	(103)	130	243
Equity securities	(8)	13	50
Change in net expected credit losses - fixed maturities	6	(125)	0
Net impairment losses recognized in operations	0	0	(34)
Commercial mortgage loans	137	(149)	(4)
Gains (losses) - derivatives, net	48	(195)	(368)
Net gains (losses) - investments and derivatives	$ 150	$ (235)	$ (59)

Net Investment Gains (Losses), All Investments

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Realized Gain (Loss), Other Investments, Net Impairment Losses

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Represents the total realized gain (loss) included in earnings during the period as a result of investments other than derivative financial instruments, net of the amount recognized in earnings for other than temporary impairments (OTTI) of investments in debt and equity securities.

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows.

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of gain (loss) included in earnings for investments classified as other.

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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