Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 |
In Millions, unless otherwise specified |
Interest rate derivatives, Asset Fair Value | $43 | $55 |
Commodity derivatives, Asset Fair Value | 134 | 156 |
Total Assets | 177 | 211 |
Interest rate derivatives, Liability Fair Value | -112 | -235 |
Preferred Units | 0 | -331 |
Embedded derivatives in the Regency Preferred Units, Liability Fair Value | -23 | -25 |
Commodity derivatives, Liability Fair Value | -103 | -168 |
Total Liabilities | -238 | -759 |
Level 1 [Member] | ' | ' |
Interest rate derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Asset Fair Value | 122 | 108 |
Total Assets | 122 | 108 |
Interest rate derivatives, Liability Fair Value | 0 | 0 |
Preferred Units | ' | 0 |
Embedded derivatives in the Regency Preferred Units, Liability Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | -92 | -118 |
Total Liabilities | -92 | -118 |
Level 2 [Member] | ' | ' |
Interest rate derivatives, Asset Fair Value | 43 | 55 |
Commodity derivatives, Asset Fair Value | 12 | 48 |
Total Assets | 55 | 103 |
Interest rate derivatives, Liability Fair Value | -112 | -235 |
Preferred Units | ' | 0 |
Embedded derivatives in the Regency Preferred Units, Liability Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | -11 | -50 |
Total Liabilities | -123 | -285 |
Level 3 [Member] | ' | ' |
Interest rate derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Total Assets | 0 | 0 |
Interest rate derivatives, Liability Fair Value | 0 | 0 |
Preferred Units | ' | -331 |
Embedded derivatives in the Regency Preferred Units, Liability Fair Value | -23 | -25 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Total Liabilities | -23 | -356 |
Commodity Derivatives - Condensate [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 2 |
Commodity derivatives, Liability Fair Value | -2 | ' |
Commodity Derivatives - Condensate [Member] | Level 1 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | 0 | ' |
Commodity Derivatives - Condensate [Member] | Level 2 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 2 |
Commodity derivatives, Liability Fair Value | -2 | ' |
Commodity Derivatives - Condensate [Member] | Level 3 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | 0 | ' |
Commodity Derivatives - Refined Products [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 25 | 5 |
Commodity derivatives, Liability Fair Value | -16 | -8 |
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 25 | 1 |
Commodity derivatives, Liability Fair Value | -16 | -1 |
Commodity Derivatives - Refined Products [Member] | Level 2 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 4 |
Commodity derivatives, Liability Fair Value | 0 | -7 |
Commodity Derivatives - Refined Products [Member] | Level 3 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Power [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 2 | 27 |
Commodity derivatives, Liability Fair Value | -1 | -27 |
Commodity Derivatives - Power [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 2 |
Commodity derivatives, Liability Fair Value | -2 | ' |
Commodity Derivatives - Power [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 1 |
Commodity derivatives, Liability Fair Value | ' | -2 |
Commodity Derivatives - Power [Member] | Level 1 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Power [Member] | Level 1 [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | 0 | ' |
Commodity Derivatives - Power [Member] | Level 1 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 1 |
Commodity derivatives, Liability Fair Value | ' | -2 |
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 2 | 27 |
Commodity derivatives, Liability Fair Value | -1 | -27 |
Commodity Derivatives - Power [Member] | Level 2 [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 2 |
Commodity derivatives, Liability Fair Value | -2 | ' |
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | ' | 0 |
Commodity Derivatives - Power [Member] | Level 3 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Power [Member] | Level 3 [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | 0 | ' |
Commodity Derivatives - Power [Member] | Level 3 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | ' | 0 |
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 4 | 11 |
Commodity derivatives, Liability Fair Value | -8 | -18 |
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 1 | 3 |
Commodity derivatives, Liability Fair Value | -2 | -2 |
Commodity Derivatives - Natural Gas [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 1 | 3 |
Commodity derivatives, Liability Fair Value | -1 | -3 |
Commodity Derivatives - Natural Gas [Member] | Options - Puts [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 1 |
Commodity derivatives, Liability Fair Value | ' | -1 |
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 1 | 1 |
Commodity Derivatives - Natural Gas [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 90 | 98 |
Commodity derivatives, Liability Fair Value | -59 | -103 |
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC/NYMEX [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 4 | 11 |
Commodity derivatives, Liability Fair Value | -8 | -18 |
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Options - Puts [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | ' | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 84 | 94 |
Commodity derivatives, Liability Fair Value | -58 | -94 |
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Basis Swaps IFERC/NYMEX [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Swing Swaps IFERC [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 1 | 3 |
Commodity derivatives, Liability Fair Value | -2 | -2 |
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 1 | 3 |
Commodity derivatives, Liability Fair Value | -1 | -3 |
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Options - Puts [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 1 |
Commodity derivatives, Liability Fair Value | ' | -1 |
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 1 | 1 |
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 6 | 4 |
Commodity derivatives, Liability Fair Value | -1 | -9 |
Commodity Derivatives - Natural Gas [Member] | Level 3 [Member] | Basis Swaps IFERC/NYMEX [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 3 [Member] | Swing Swaps IFERC [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 3 [Member] | Call Option [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 3 [Member] | Options - Puts [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | ' | 0 |
Commodity derivatives, Liability Fair Value | ' | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 3 [Member] | Forward Physical Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity Derivatives - Natural Gas [Member] | Level 3 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Commodity Derivatives - NGLs [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 10 | 2 |
Commodity derivatives, Liability Fair Value | -10 | -4 |
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 9 | 1 |
Commodity derivatives, Liability Fair Value | -8 | -3 |
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 1 | 1 |
Commodity derivatives, Liability Fair Value | -2 | -1 |
Commodity Derivatives - NGLs [Member] | Level 3 [Member] | Forward Swaps [Member] | ' | ' |
Commodity derivatives, Asset Fair Value | 0 | 0 |
Commodity derivatives, Liability Fair Value | 0 | 0 |
Crude Oil [Member] | Future [Member] | ' | ' |
Commodity derivatives, Liability Fair Value | -2 | ' |
Crude Oil [Member] | Level 1 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Liability Fair Value | -2 | ' |
Crude Oil [Member] | Level 2 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Liability Fair Value | 0 | ' |
Crude Oil [Member] | Level 3 [Member] | Future [Member] | ' | ' |
Commodity derivatives, Liability Fair Value | $0 | ' |