Related Party Transactions (Schedule of related Party Transactions) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Revenue—Non-Regulated	$ 7,835	$ 8,187	$ 7,399
Cost of Sales—Non-Regulated	5,807	5,987	5,733
Interest expense	1,482	1,544	1,530
Affiliated Entity
Related Party Transaction [Line Items]
Revenue—Non-Regulated	825	820	657
Cost of Sales—Non-Regulated	161	120	125
Interest expense	$ 5	$ 10	$ 7