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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Price Risk Derivative Assets, at Fair Value | $ 266 | $ 168
Other Assets, Fair Value Disclosure | 36 | 34
Assets, Fair Value Disclosure | 302 | 202
Interest Rate Derivative Liabilities, at Fair Value | (254) | (448)
Price Risk Derivative Liabilities, at Fair Value | (324) | (269)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (578) | (717)
Level 1 |  |
Price Risk Derivative Assets, at Fair Value | 245 | 158
Other Assets, Fair Value Disclosure | 24 | 22
Assets, Fair Value Disclosure | 269 | 180
Interest Rate Derivative Liabilities, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | (313) | (265)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (313) | (265)
Level 2 |  |
Price Risk Derivative Assets, at Fair Value | 21 | 10
Other Assets, Fair Value Disclosure | 12 | 12
Assets, Fair Value Disclosure | 33 | 22
Interest Rate Derivative Liabilities, at Fair Value | (254) | (448)
Price Risk Derivative Liabilities, at Fair Value | (11) | (4)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (265) | (452)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 14 | 12
Price Risk Derivative Liabilities, at Fair Value | (10) | (11)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 | 1
Price Risk Derivative Liabilities, at Fair Value |  | (3)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 2 | 13
Price Risk Derivative Liabilities, at Fair Value | (7) | (13)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 6 | 5
Price Risk Derivative Liabilities, at Fair Value | (2) |
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member] |  |
Price Risk Derivative Liabilities, at Fair Value |  | (1)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member] |  |
Price Risk Derivative Assets, at Fair Value | 14 | 12
Price Risk Derivative Liabilities, at Fair Value | (10) | (11)
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 |  | 0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 2 | 13
Price Risk Derivative Liabilities, at Fair Value | (7) | (13)
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 |
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Contracts [Member] |  |
Price Risk Derivative Liabilities, at Fair Value |  | 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 | 1 | 1
Price Risk Derivative Liabilities, at Fair Value |  | (3)
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 | 6 | 5
Price Risk Derivative Liabilities, at Fair Value | (2) |
Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Contracts [Member] |  |
Price Risk Derivative Liabilities, at Fair Value |  | (1)
Commodity Derivatives - Refined Products [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 2 | 3
Price Risk Derivative Liabilities, at Fair Value | (2) | (11)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 2 | 3
Price Risk Derivative Liabilities, at Fair Value | (2) | (11)
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 | 135 |
Price Risk Derivative Liabilities, at Fair Value | (130) |
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 135 |
Price Risk Derivative Liabilities, at Fair Value | (130) |
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 - Power [Member] | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 14 | 4
Price Risk Derivative Liabilities, at Fair Value | (9) |
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 | 1 | 2
Price Risk Derivative Liabilities, at Fair Value | (2) | (3)
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 |
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 | 1 | 2
Price Risk Derivative Liabilities, at Fair Value | (2) | (3)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 14 | 4
Price Risk Derivative Liabilities, at Fair Value | (9) |
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 | 91 | 127
Price Risk Derivative Liabilities, at Fair Value | (162) | (227)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 91 | 127
Price Risk Derivative Liabilities, at Fair Value | (162) | (227)
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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