Related Party (Debt Agreements) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Related Party Transactions [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000		$ 2,000,000,000
Short-term Debt with Pru Funding	84,000,000		84,000,000		28,000,000
Interest Expense, Short-term Borrowings	91,000	35,000	249,000	199,000
Long-term debt with PFI	600,000,000	175,000,000	600,000,000	175,000,000	600,000,000
Long-term debt interest expense	$ 7,000,000	$ 9,000,000	$ 20,000,000	$ 27,000,000