Related Party Transactions (Narrative) (Details)	1 Months Ended							6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) policy	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 01, 2016 USD ($)
Related Party Transaction [Line Items]
Other long-term investments				$ 379,237,000						$ 344,463,000	$ 379,237,000
Net investment income										375,950,000	416,587,000	$ 404,018,000
Contributed capital								$ 405,321,000	$ 405,321,000	405,321,000	0	0
Prudential Insurance
Related Party Transaction [Line Items]
Contributed capital	$ 200,000,000		$ 5,000,000								0	0
Dividend		$ 2,593,000,000		200,000,000	$ 230,000,000	$ 410,000,000	$ 338,000,000
Prudential Insurance and Prudential FInancial
Related Party Transaction [Line Items]
Life Insurance, Corporate or Bank Owned, amount				2,873,000,000						3,367,000,000	2,873,000,000
Fees related to Life Insurance, Corporate or Bank Owned, amount										42,000,000	45,000,000	45,000,000
Maximum amount of mortality risk										3,500,000
Prudential Insurance
Related Party Transaction [Line Items]
Stock option program plan expense										1,000,000	1,000,000	1,000,000
Deferred compensation program expense										8,000,000	7,000,000	7,000,000
Pension plan expense										23,000,000	22,000,000	20,000,000
Welfare plan expense										$ 28,000,000	26,000,000	28,000,000
Defined contribution plan, employer matching contribution, percent (up to)										4.00%
Defined contribution plan, cost recognized										$ 10,000,000	8,000,000	9,000,000
Number of Corporate Owned Life Insurance policies sold | policy										5
Prudential Financial
Related Party Transaction [Line Items]
Number of Corporate Owned Life Insurance policies sold | policy										1
Affiliated Entity
Related Party Transaction [Line Items]
Accrued interested receivable related to long-tern notes receivable				1,000,000						$ 1,000,000	1,000,000
Revenues related to long-term notes receivable										6,000,000	7,000,000	14,000,000
Line of credit facility, maximum borrowing capacity										2,200,000,000.0
Interest expense related to loans payable										13,000,000	51,000,000	52,000,000
Prepaid debt													$ 125,000,000
Affiliated Entity | PAD
Related Party Transaction [Line Items]
Commissions and fees										709,000,000	771,000,000	862,000,000
Affiliated Entity | ASTISI and Prudential Investments
Related Party Transaction [Line Items]
Revenue administrative sharing agreement										295,000,000	347,000,000	364,000,000
Affiliated Entity | Prudential Investments
Related Party Transaction [Line Items]
Revenue administrative sharing agreement										13,000,000	13,000,000	12,000,000
Affiliated Entity | PGIM
Related Party Transaction [Line Items]
Net investment income										15,000,000	17,000,000	15,000,000
Prudential Financial Joint Venture
Related Party Transaction [Line Items]
Other long-term investments				$ 146,000,000						100,000,000	146,000,000
Net investment income										$ 2,000,000	$ 0	$ 8,000,000