Related Party Transactions Related Party Receivables and Payables (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Related party receivables	$ 18	$ 8
Related party payables	57	95
HPC [Member]
Related Party Transaction [Line Items]
Related party receivables	1	1
Related party payables	1	1
ETE And Its Subsidiaries [Member]
Related Party Transaction [Line Items]
Related party receivables	17	5
Related party payables	56	94
Ranch JV {Member]
Related Party Transaction [Line Items]
Related party receivables	$ 0	$ 2