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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Price Risk Derivative Assets, at Fair Value | $ 338 | $ 560
Other Assets, Fair Value Disclosure | 28 | 26
Assets, Fair Value Disclosure | 366 | 586
Interest Rate Derivative Liabilities, at Fair Value | (232) | (163)
Price Risk Derivative Liabilities, at Fair Value | (309) | (583)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (541) | (746)
Level 1 |  |
Price Risk Derivative Assets, at Fair Value | 282 | 448
Other Assets, Fair Value Disclosure | 18 | 17
Assets, Fair Value Disclosure | 300 | 465
Interest Rate Derivative Liabilities, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | (267) | (480)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (267) | (480)
Level 2 |  |
Price Risk Derivative Assets, at Fair Value | 56 | 112
Other Assets, Fair Value Disclosure | 10 | 9
Assets, Fair Value Disclosure | 66 | 121
Interest Rate Derivative Liabilities, at Fair Value | (232) | (163)
Price Risk Derivative Liabilities, at Fair Value | (42) | (103)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (274) | (266)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 40 | 42
Price Risk Derivative Liabilities, at Fair Value | (81) | (91)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 3 | 52
Price Risk Derivative Liabilities, at Fair Value | (4) | (40)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 16 | 97
Price Risk Derivative Liabilities, at Fair Value | (18) | (88)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 10 | 20
Price Risk Derivative Liabilities, at Fair Value | (5) | (21)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 40 | 42
Price Risk Derivative Liabilities, at Fair Value | (81) | (91)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 | 8
Price Risk Derivative Liabilities, at Fair Value | (2) | 0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 16 | 97
Price Risk Derivative Liabilities, at Fair Value | (18) | (88)
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 | 0
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 | 0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 2 | 44
Price Risk Derivative Liabilities, at Fair Value | (2) | (40)
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 | 0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 10 | 20
Price Risk Derivative Liabilities, at Fair Value | (5) | (21)
Commodity Derivatives - Refined Products [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 5 | 7
Price Risk Derivative Liabilities, at Fair Value | (4) | (15)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 5 | 7
Price Risk Derivative Liabilities, at Fair Value | (4) | (15)
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
Commodity Derivatives - Crude [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 51 |
Price Risk Derivative Liabilities, at Fair Value | (1) |
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 1
Price Risk Derivative Liabilities, at Fair Value |  | (61)
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 51 |
Price Risk Derivative Liabilities, at Fair Value | (1) |
Commodity Derivatives - Crude [Member] | Level 1 | Forwards Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 1
Price Risk Derivative Liabilities, at Fair Value |  | (61)
Commodity Derivatives - Crude [Member] | Level 2 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 |
Price Risk Derivative Liabilities, at Fair Value | 0 |
Commodity Derivatives - Crude [Member] | Level 2 | Forwards Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 0
Price Risk Derivative Liabilities, at Fair Value |  | 0
Commodity Derivatives - Power [Member] | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 44 | 48
Price Risk Derivative Liabilities, at Fair Value | (35) | (42)
Commodity Derivatives - Power [Member] | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 1
Commodity Derivatives - Power [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 7 | 1
Price Risk Derivative Liabilities, at Fair Value | (6) | (1)
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 | 0
Commodity Derivatives - Power [Member] | Level 1 | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 1
Commodity Derivatives - Power [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 7 | 1
Price Risk Derivative Liabilities, at Fair Value | (6) | (1)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 44 | 48
Price Risk Derivative Liabilities, at Fair Value | (35) | (42)
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 0
Commodity Derivatives - Power [Member] | Level 2 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | 0 | 0
Commodity Derivatives - NGLs [Member] | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 162 | 291
Price Risk Derivative Liabilities, at Fair Value | (155) | (224)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 162 | 291
Price Risk Derivative Liabilities, at Fair Value | (155) | (224)
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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