Schedule IV - Schedule of Reinsurance Level 4 (Details) - USD ($) $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
May 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net [Abstract]
Direct Premiums, Life Insurance in Force	$ 266,190	$ 259,930	$ 249,728	$ 271,213
Ceded Premiums Earned	197,736	191,858	181,779	202,003
Assumed Premiums, Life Insurance in Force	515	487	378	526
Premiums, Net, Life Insurance in Force	$ 68,969	$ 68,559	$ 68,327	$ 69,736
Life Insurance in Force Premiums, Percentage Assumed to Net	1.00%	1.00%	1.00%	1.00%
Insurance Services Revenue [Abstract]
Direct Premiums Earned	$ 1,059	$ 1,439	$ 2,375	$ 2,434
Ceded Premiums Earned	684	972	1,627	1,539
Assumed Premiums Earned	48	66	115	116
Premiums Earned, Net, Life	$ 423	$ 533	$ 863	$ 1,011
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	11.00%	12.00%	13.00%	11.00%
Life and Annuity Insurance Product Line [Member]
Insurance Services Revenue [Abstract]
Direct Premiums Earned	$ 1,033	$ 1,404	$ 2,350	$ 2,361
Ceded Premiums Earned	658	937	1,602	1,466
Assumed Premiums Earned	48	66	115	116
Premiums Earned, Net, Life	$ 423	$ 533	$ 863	$ 1,011
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	11.00%	12.00%	13.00%	11.00%
Accident and Health Insurance Product Line [Member]
Insurance Services Revenue [Abstract]
Direct Premiums Earned	$ 26	$ 35	$ 25	$ 73
Ceded Premiums Earned	26	35	25	73
Assumed Premiums Earned	0	0	0	0
Premiums Earned, Net, Life	$ 0	$ 0	$ 0	$ 0
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net	0.00%	0.00%	0.00%	0.00%

Amount of life insurance issued and outstanding assumed from other entity, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value.

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-Paragraph Column D
-Subsection 17

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Amount of life insurance issued and outstanding ceded to other entity, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value.

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Amount, before effect of reinsurance, of life insurance issued and outstanding, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value.

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Percentage of assumed life insurance contract issued and outstanding to life insurance contract issued and outstanding after effect of reinsurance, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value.

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