Income Taxes Components of Net Deferred Income Tax (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Net deferred income tax liability, beginning of year	$ (3,881)	$ (3,606)	$ (123)
Increase in Tax Liability Attributable to Southern Union	0	1,420
Increase in Tax Liability Attributable to Sunoco Acquisition	0	1,989
Deferred Income Tax Liability as a Result of SUGS Contribution to Regency	(115)	0
Tax provision (including discontinued operations)	(111)	(73)
Increase (Decrease) in Other Deferred Liability	$ (49)	$ (1)