Represents the interest rate on collateral loans on life insurance policies.

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Represents the interest rate on standard insurance policy loans receivable.

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Represents the carrying amount of investments which do not generate any income.

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Represents the minimum percentage of the underlying collateral guaranteed by a third party.

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Represents the value of securities that are not publicly traded.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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INVESTMENT OPERATIONS - Narrative (Details)	1 Months Ended	11 Months Ended	12 Months Ended
INVESTMENT OPERATIONS - Narrative (Details)	Jan. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) position	Dec. 31, 2016 USD ($)
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			$ 601,185,000	$ 1,196,101,000
Minimum percentage of underlying collateral guaranteed by third party			97.00%	97.00%
Number of positions \| position			1,844
Fair Value			$ 39,488,434,000	$ 36,328,836,000
Available-for-sale securities, amortized cost			39,455,935,000	37,991,304,000
Securities in trading portfolio			2,725,694,000	2,699,591,000
Total OTTI Recognized in OCI		$ 0	0	0
Non-income producing investments			17,500,000
Policy loans			$ 1,615,615,000	1,650,240,000
Interest rate on collateral loans on life insurance policies (as a percent)			13.64%
Minimum
Available-for-sale securities
Interest rate on standard policy loans (as a percent)			3.00%
Maximum
Available-for-sale securities
Interest rate on standard policy loans (as a percent)			8.00%
Below investment grade
Available-for-sale securities
Fair Value			$ 1,900,000,000
Available-for-sale securities, amortized cost			1,900,000,000
Securities in trading portfolio			228,900,000
Securities not publicly traded			310,700,000
Residential mortgage-backed securities
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			13,064,000	4,117,000
Fair Value			2,318,493,000	1,889,607,000
Available-for-sale securities, amortized cost			2,321,811,000	1,904,165,000
Securities in trading portfolio			259,694,000	255,027,000
Commercial mortgage-backed securities
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			21,031,000	4,013,000
Fair Value			1,860,488,000	1,782,497,000
Available-for-sale securities, amortized cost			1,885,109,000	1,820,644,000
Securities in trading portfolio			146,804,000	149,683,000
Other asset-backed securities
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			5,441,000	11,407,000
Fair Value			1,249,549,000	1,211,533,000
Available-for-sale securities, amortized cost			1,234,376,000	1,210,490,000
Securities in trading portfolio			138,097,000	200,084,000
U.S. government-related securities
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			31,489,000	1,000
Fair Value			1,223,252,000	1,268,159,000
Available-for-sale securities, amortized cost			1,255,244,000	1,308,192,000
Securities in trading portfolio			27,234,000	26,961,000
Other government-related securities
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			4,779,000	11,890,000
Fair Value			285,233,000	237,926,000
Available-for-sale securities, amortized cost			280,780,000	251,197,000
Securities in trading portfolio			63,925,000	63,012,000
States, municipals, and political subdivisions
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			43,875,000	41,749,000
Fair Value			1,741,645,000	1,656,503,000
Available-for-sale securities, amortized cost			1,770,299,000	1,760,837,000
Securities in trading portfolio			326,925,000	316,519,000
Corporate securities
Available-for-sale securities
Continuous unrealized loss position, 12 months or longer			471,752,000	1,114,635,000
Fair Value			29,537,546,000	27,224,649,000
Available-for-sale securities, amortized cost			29,446,365,000	28,655,364,000
Securities in trading portfolio			1,698,183,000	1,624,589,000
Fixed Maturities
Available-for-sale securities
Fair Value			38,307,297,000	35,356,717,000
Available-for-sale securities, amortized cost			38,288,346,000	37,005,251,000
Securities in trading portfolio			2,664,189,000	2,639,860,000
Total OTTI Recognized in OCI			0	0
Gross Unrecognized Holding Gains			76,586,000	30,385,000
Unrecognized holding loss, held-to-maturity			$ 19,163,000	$ 67,222,000
Predecessor
Available-for-sale securities
Total OTTI Recognized in OCI	$ 0