Related Party Transactions (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) policy	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Commissions and fees	$ 139,189,000	$ 129,155,000
Other invested assets	358,288,000		$ 377,429,000
Net investment income	93,250,000	77,915,000
Fee income from revenue sharing agreement	3,657,000	3,473,000
Debt Outstanding	0		0
Contributed Capital	0
Dividends	0		0
Prudential Insurance
Related Party Transaction [Line Items]
Contributed Capital		6,000,000
Prudential Insurance
Related Party Transaction [Line Items]
Stock option program plan expense	100,000	200,000
Deferred compensation program expense	3,000,000	2,000,000
Pension plan expense	5,000,000	6,000,000
Welfare plan expense	$ 6,000,000	7,000,000
Defined contribution plan, employer matching contribution, percent (up to)	4.00%
Defined contribution plan, cost recognized	$ 2,000,000	3,000,000
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	$ 4,014,000,000		3,631,000,000
Fees related to Life Insurance, Corporate or Bank Owned, amount	13,000,000	12,000,000
Maximum amount of mortality risk	3,500,000
Prudential Financial
Related Party Transaction [Line Items]
Company's share of corporate expenses	$ 17,000,000	18,000,000
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	$ 600,000		1,000,000
Revenues related to long-term notes receivable	1,000,000	1,000,000
Line of credit facility, maximum borrowing capacity	2,200,000,000
Interest expense related to loans payable	200,000	100,000
Affiliated Entity | PAD
Related Party Transaction [Line Items]
Commissions and fees	179,000,000	175,000,000
Affiliated Entity | ASTISI and PGIM Investments
Related Party Transaction [Line Items]
Fee income from revenue sharing agreement	81,000,000	84,000,000
Affiliated Entity | PGIM Investments
Related Party Transaction [Line Items]
Fee income from revenue sharing agreement	2,000,000	2,000,000
Affiliated Entity | PGIM
Related Party Transaction [Line Items]
Net investment income	3,000,000	3,000,000
Prudential Financial Joint Ventures
Related Party Transaction [Line Items]
Other invested assets	96,000,000		$ 88,000,000
Net investment income	$ 5,000,000	$ 100,000