Related Party (Debt Agreements) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transactions [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000
Short-term Debt with Pru Funding	0	28,000,000
Interest Expense, Short-term Borrowings	341,000	263,000	438,000
Prudential Financial Debt, Interest Rate	4.49%	5.18%
Prudential Financial Debt, Repayment Amount	200,000,000	175,000,000
Long-term debt with PFI	400,000,000	600,000,000
Long-term debt interest expense	27,000,000	36,000,000	36,000,000
Affiliated Investment Management Expense	$ 8,000,000	$ 9,000,000	$ 8,000,000