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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Price Risk Derivative Assets, at Fair Value | $ 679 | $ 560
Other Assets, Fair Value Disclosure | 29 | 26
Assets, Fair Value Disclosure | 708 | 586
Interest Rate Derivative Liabilities, at Fair Value | (528) | (163)
Price Risk Derivative Liabilities, at Fair Value | (597) | (583)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (1,125) | (746)
Level 1 |  |
Price Risk Derivative Assets, at Fair Value | 648 | 448
Other Assets, Fair Value Disclosure | 19 | 17
Assets, Fair Value Disclosure | 667 | 465
Interest Rate Derivative Liabilities, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | (572) | (480)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (572) | (480)
Level 2 |  |
Price Risk Derivative Assets, at Fair Value | 31 | 112
Other Assets, Fair Value Disclosure | 10 | 9
Assets, Fair Value Disclosure | 41 | 121
Interest Rate Derivative Liabilities, at Fair Value | (528) | (163)
Price Risk Derivative Liabilities, at Fair Value | (25) | (103)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (553) | (266)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 27 | 42
Price Risk Derivative Liabilities, at Fair Value | (54) | (91)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 5 | 52
Price Risk Derivative Liabilities, at Fair Value | (9) | (40)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 44 | 97
Price Risk Derivative Liabilities, at Fair Value | (29) | (88)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 5 | 20
Price Risk Derivative Liabilities, at Fair Value | (2) | (21)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 27 | 42
Price Risk Derivative Liabilities, at Fair Value | (54) | (91)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 8
Price Risk Derivative Liabilities, at Fair Value | 0 | 0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 44 | 97
Price Risk Derivative Liabilities, at Fair Value | (29) | (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 | 5 | 44
Price Risk Derivative Liabilities, at Fair Value | (9) | (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 | 5 | 20
Price Risk Derivative Liabilities, at Fair Value | (2) | (21)
Commodity Derivatives - Refined Products [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 | 7
Price Risk Derivative Liabilities, at Fair Value | (3) | (15)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 | 7
Price Risk Derivative Liabilities, at Fair Value | (3) | (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 | 43 |
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 | 43 |
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 | 21 | 48
Price Risk Derivative Liabilities, at Fair Value | (14) | (42)
Commodity Derivatives - Power [Member] | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 1
Price Risk Derivative Liabilities, at Fair Value | 1 |
Commodity Derivatives - Power [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 4 | 1
Price Risk Derivative Liabilities, at Fair Value | (5) | (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
Price Risk Derivative Liabilities, at Fair Value | (1) |
Commodity Derivatives - Power [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 4 | 1
Price Risk Derivative Liabilities, at Fair Value | (5) | (1)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 21 | 48
Price Risk Derivative Liabilities, at Fair Value | (14) | (42)
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value |  | 0
Price Risk Derivative Liabilities, 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 | 529 | 291
Price Risk Derivative Liabilities, at Fair Value | (479) | (224)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 529 | 291
Price Risk Derivative Liabilities, at Fair Value | (479) | (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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