Related Party (Affiliated Investment Management Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Related Party Transactions [Abstract]
Pim Management Expenses	$ 2	$ 2	$ 3	$ 4