Related Party (Expense Charges and Allocations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related Party Transactions [Abstract]
Stock or Unit Option Plan Expense	$ 1	$ 1	$ 1	$ 1
Deferred Compensation Arrangement with Individual, Compensation Expense	1	2	4	5
Pension Expense	5	4	16	13
Defined Contribution Plan Employer Matching Contribution Percent			4.00%
Defined Contribution Plan, Cost Recognized	2	2	6	6
Commissions Paid To PAD	$ 196	$ 349	$ 673	$ 966