Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	$ 119,214	$ 209,760
Less than Twelve Months, Gross Unrealized Losses	1,325	4,369
Twelve Months or More, Fair Value	1,583,204	1,489,475
Twelve Months or More, Gross Unrealized Losses	197,806	216,621
Total, Fair Value	1,702,418	1,699,235
Total, Gross Unrealized Losses	199,131	220,990
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	0	49,081
Less than Twelve Months, Gross Unrealized Losses	0	936
Twelve Months or More, Fair Value	51,013	1,962
Twelve Months or More, Gross Unrealized Losses	492	218
Total, Fair Value	51,013	51,043
Total, Gross Unrealized Losses	492	1,154
Obligations of U.S. states and their political subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	33,225	22,856
Less than Twelve Months, Gross Unrealized Losses	193	186
Twelve Months or More, Fair Value	73,124	61,445
Twelve Months or More, Gross Unrealized Losses	2,193	2,647
Total, Fair Value	106,349	84,301
Total, Gross Unrealized Losses	2,386	2,833
Foreign government securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	820	5,656
Less than Twelve Months, Gross Unrealized Losses	4	91
Twelve Months or More, Fair Value	67,024	69,066
Twelve Months or More, Gross Unrealized Losses	14,124	14,602
Total, Fair Value	67,844	74,722
Total, Gross Unrealized Losses	14,128	14,693
U.S. public corporate securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	62,023	86,203
Less than Twelve Months, Gross Unrealized Losses	908	1,688
Twelve Months or More, Fair Value	953,916	913,776
Twelve Months or More, Gross Unrealized Losses	137,480	146,213
Total, Fair Value	1,015,939	999,979
Total, Gross Unrealized Losses	138,388	147,901
U.S. private corporate securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	11,004	27,883
Less than Twelve Months, Gross Unrealized Losses	159	366
Twelve Months or More, Fair Value	115,138	117,409
Twelve Months or More, Gross Unrealized Losses	5,932	8,518
Total, Fair Value	126,142	145,292
Total, Gross Unrealized Losses	6,091	8,884
Foreign public corporate securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	11,319	5,029
Less than Twelve Months, Gross Unrealized Losses	58	135
Twelve Months or More, Fair Value	113,583	115,462
Twelve Months or More, Gross Unrealized Losses	20,531	21,854
Total, Fair Value	124,902	120,491
Total, Gross Unrealized Losses	20,589	21,989
Foreign private corporate securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	447	5,007
Less than Twelve Months, Gross Unrealized Losses	1	51
Twelve Months or More, Fair Value	95,797	98,159
Twelve Months or More, Gross Unrealized Losses	12,192	14,740
Total, Fair Value	96,244	103,166
Total, Gross Unrealized Losses	12,193	14,791
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	350	7,899
Less than Twelve Months, Gross Unrealized Losses	0	914
Twelve Months or More, Fair Value	7,904	4,775
Twelve Months or More, Gross Unrealized Losses	575	55
Total, Fair Value	8,254	12,674
Total, Gross Unrealized Losses	575	969
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	0	0
Less than Twelve Months, Gross Unrealized Losses	0	0
Twelve Months or More, Fair Value	94,522	96,699
Twelve Months or More, Gross Unrealized Losses	4,063	7,356
Total, Fair Value	94,522	96,699
Total, Gross Unrealized Losses	4,063	7,356
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than Twelve Months, Fair Value	26	146
Less than Twelve Months, Gross Unrealized Losses	2	2
Twelve Months or More, Fair Value	11,183	10,722
Twelve Months or More, Gross Unrealized Losses	224	418
Total, Fair Value	11,209	10,868
Total, Gross Unrealized Losses	$ 226	$ 420

PRUCO LIFE INSURANCE OF NEW JERSEY 10-Q