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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities, Fair Value Disclosure, Recurring |  | $ (560)
Level 1 |  |
Liabilities, Fair Value Disclosure, Recurring |  | (303)
Level 2 |  |
Liabilities, Fair Value Disclosure, Recurring |  | (257)
Fair Value, Measurements, Recurring [Member] |  |
Price Risk Derivative Assets, at Fair Value | $ 255 | 321
Other Assets, Fair Value Disclosure | 21 | 21
Assets, Fair Value Disclosure | 276 | 342
Interest Rate Derivative Liabilities, at Fair Value | (167) | (219)
Price Risk Derivative Liabilities, at Fair Value | (350) | (341)
Liabilities, Fair Value Disclosure, Recurring | (517) |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |
Price Risk Derivative Assets, at Fair Value | 169 | 277
Other Assets, Fair Value Disclosure | 14 | 14
Assets, Fair Value Disclosure | 183 | 291
Interest Rate Derivative Liabilities, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | (271) | (303)
Liabilities, Fair Value Disclosure, Recurring | (271) |
Fair Value, Measurements, Recurring [Member] | Level 2 |  |
Price Risk Derivative Assets, at Fair Value | 86 | 44
Other Assets, Fair Value Disclosure | 7 | 7
Assets, Fair Value Disclosure | 93 | 51
Interest Rate Derivative Liabilities, at Fair Value | (167) | (219)
Price Risk Derivative Liabilities, at Fair Value | (79) | (38)
Liabilities, Fair Value Disclosure, Recurring | (246) |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 35 | 11
Price Risk Derivative Liabilities, at Fair Value |  | (24)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 | 13
Price Risk Derivative Liabilities, at Fair Value |  | (15)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 14 | 70
Price Risk Derivative Liabilities, at Fair Value |  | (57)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 7 | 8
Price Risk Derivative Liabilities, at Fair Value |  | 2
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 35 | 11
Price Risk Derivative Liabilities, at Fair Value |  | (24)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value |  | (1)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 14 | 70
Price Risk Derivative Liabilities, at Fair Value |  | (57)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value |  | 0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value |  | 0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 | 13
Price Risk Derivative Liabilities, at Fair Value |  | (14)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value |  | 0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 7 | 8
Price Risk Derivative Liabilities, at Fair Value |  | 2
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | (81) |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | (1) |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | (13) |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | (6) |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Forward Swaps [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 0 |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | (81) |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 0 |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 1 | Forward Physical Swaps [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 13 |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Forward Swaps [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 6 |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 0 |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | (1) |
Fair Value, Measurements, Recurring [Member] | Commodity Natural Gas [Member] | Level 2 | Forward Physical Swaps [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 0 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Refined Products [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 3 | 1
Price Risk Derivative Liabilities, at Fair Value | (6) | (28)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 3 | 1
Price Risk Derivative Liabilities, at Fair Value | (6) | (28)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Refined Products [Member] | Level 2 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Crude [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 2
Price Risk Derivative Liabilities, at Fair Value |  | (1)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Crude [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 2
Price Risk Derivative Liabilities, at Fair Value |  | (1)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Crude [Member] | Level 2 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 0
Price Risk Derivative Liabilities, at Fair Value |  | 0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 78 | 23
Price Risk Derivative Liabilities, at Fair Value | (72) |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Options - Puts [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Future [Member] |  |
Price Risk Derivative Liabilities, at Fair Value |  | (22)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value |  | 0
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | 0 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 1 | Options - Puts [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 78 | 23
Price Risk Derivative Liabilities, at Fair Value |  | (22)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Liabilities, at Fair Value | (72) |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Power [Member] | Level 2 | Options - Puts [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 |
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - NGLs [Member] | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 115 | 193
Price Risk Derivative Liabilities, at Fair Value | (169) | (192)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 115 | 193
Price Risk Derivative Liabilities, at Fair Value | 169 | (192)
Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - NGLs [Member] | Level 2 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | $ 0 | $ 0

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