Related Party Transactions (Narrative) (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) policy	Sep. 30, 2019 USD ($)
Related Party Transaction [Line Items]
Commissions and fees	$ 151,080,000			$ 110,629,000	$ 452,084,000	$ 398,489,000
Other invested assets	485,132,000		$ 429,558,000		485,132,000
Net investment income	93,992,000			95,256,000	257,035,000	294,068,000
Fee income from revenue sharing agreement	4,964,000			4,136,000	13,654,000	11,754,000
Debt Outstanding	4,300,000		2,800,000		4,300,000
Dividends			250,000,000		0
Prudential Insurance
Related Party Transaction [Line Items]
Contributed Capital	75,000,000	$ 325,000,000	6,000,000
Prudential Insurance
Related Party Transaction [Line Items]
Stock option program plan expense	400,000			200,000	900,000	900,000
Deferred compensation program expense	1,300,000			800,000	4,300,000	4,700,000
Pension plan expense	4,000,000			5,000,000	13,000,000	15,000,000
Welfare plan expense	5,000,000			6,000,000	$ 14,000,000	18,000,000
Defined contribution plan, employer matching contribution, percent (up to)					4.00%
Defined contribution plan, cost recognized	2,000,000			2,000,000	$ 6,000,000	7,000,000
Number of Corporate Owned Life Insurance policies sold | policy					5
Prudential Insurance and Prudential Financial
Related Party Transaction [Line Items]
Life Insurance, Corporate or Bank Owned, amount	4,439,000,000		4,339,000,000		$ 4,439,000,000
Fees related to Life Insurance, Corporate or Bank Owned, amount	12,000,000			12,000,000	37,000,000	36,000,000
Maximum amount of mortality risk	3,500,000				3,500,000
Prudential Financial
Related Party Transaction [Line Items]
Company's share of corporate expenses	19,000,000			18,000,000	$ 44,000,000	56,000,000
Number of Corporate Owned Life Insurance policies sold | policy					1
Affiliated Entity
Related Party Transaction [Line Items]
Accrued interest receivable related to long-tern notes receivable	1,000,000		1,000,000		$ 1,000,000
Revenues related to long-term notes receivable	1,000,000			1,000,000	3,000,000	3,000,000
Line of credit facility, maximum borrowing capacity	2,200,000,000				2,200,000,000
Interest expense related to loans payable	100,000			900,000	700,000	1,700,000
Affiliated Entity | PAD
Related Party Transaction [Line Items]
Commissions and fees	115,000,000			198,000,000	413,000,000	574,000,000
Affiliated Entity | ASTISI and PGIM Investments
Related Party Transaction [Line Items]
Fee income from revenue sharing agreement	88,000,000			87,000,000	254,000,000	252,000,000
Affiliated Entity | PGIM Investments
Related Party Transaction [Line Items]
Fee income from revenue sharing agreement	3,000,000			3,000,000	8,000,000	8,000,000
Affiliated Entity | PGIM
Related Party Transaction [Line Items]
Net investment income	4,000,000			3,000,000	11,000,000	10,000,000
Prudential Financial Joint Ventures
Related Party Transaction [Line Items]
Other invested assets	107,000,000		$ 96,000,000		107,000,000
Net investment income	$ 7,000,000			$ 0	$ 5,000,000	$ 8,000,000