Related Party Transactions (Debt Agreements) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transactions [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000
Short-term Debt with Pru Funding	1,000,000	$ 54,000,000
Interest Expense, Short-term Borrowings (less than)	1,000,000	1,000,000	$ 1,000,000
Prudential Financial Debt, Borrowing Amount	$ 0	0
Prudential Financial Debt, Interest Rate	4.49%
Prudential Financial Debt, Repayment Amount	$ 200,000,000
Long-term debt interest expense	$ 1,000,000	$ 9,000,000	$ 17,000,000