Related Party Transactions (Affiliated Asset Transfers) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Prudential Insurance March 15 Purchase
Related Party Transaction [Line Items]
Fair Value		$ 92
Book Value		74
APIC, Net of Tax Increase/(Decrease)		(12)
Realized Investment Gain/(Loss), Net		0
Derivative Gain/(Loss)		0
Prudential Insurance June 15 Purchase
Related Party Transaction [Line Items]
Fair Value		11
Book Value		10
APIC, Net of Tax Increase/(Decrease)		(1)
Realized Investment Gain/(Loss), Net		0
Derivative Gain/(Loss)		$ 0
Prudential Insurance March 16 Sale
Related Party Transaction [Line Items]
Fair Value	$ 89
Book Value	89
APIC, Net of Tax Increase/(Decrease)	(1)
Realized Investment Gain/(Loss), Net	0
Derivative Gain/(Loss)	$ 0