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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, 2021 | Dec. 31, 2020
--- | --- | ---
Price Risk Derivative Assets, at Fair Value | $ 1,034 | $ 168
Other Assets, Fair Value Disclosure | 37 | 34
Assets, Fair Value Disclosure | 1,071 | 202
Interest Rate Derivative Liabilities, at Fair Value | (376) | (448)
Price Risk Derivative Liabilities, at Fair Value | (1,081) | (269)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (1,457) | (717)
Level 1 |  |
Price Risk Derivative Assets, at Fair Value | 994 | 158
Other Assets, Fair Value Disclosure | 24 | 22
Assets, Fair Value Disclosure | 1,018 | 180
Interest Rate Derivative Liabilities, at Fair Value | 0 | 0
Price Risk Derivative Liabilities, at Fair Value | (1,059) | (265)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (1,059) | (265)
Level 2 |  |
Price Risk Derivative Assets, at Fair Value | 40 | 10
Other Assets, Fair Value Disclosure | 13 | 12
Assets, Fair Value Disclosure | 53 | 22
Interest Rate Derivative Liabilities, at Fair Value | (376) | (448)
Price Risk Derivative Liabilities, at Fair Value | (22) | (4)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | (398) | (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 | (5) | (11)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 11 | 1
Price Risk Derivative Liabilities, at Fair Value | (7) | (3)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 4 | 13
Price Risk Derivative Liabilities, at Fair Value | (78) | (13)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 4 | 5
Price Risk Derivative Liabilities, at Fair Value | (1) |
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 | (5) | (11)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member] |  |
Price Risk Derivative Assets, at Fair Value | 11 | 0
Price Risk Derivative Liabilities, at Fair Value | (7) | 0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member] |  |
Price Risk Derivative Assets, at Fair Value | 4 | 13
Price Risk Derivative Liabilities, at Fair Value | (78) | (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 | 0 | 1
Price Risk Derivative Liabilities, at Fair Value | 0 | (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 | 4 | 5
Price Risk Derivative Liabilities, at Fair Value | (1) |
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 | 7 | 3
Price Risk Derivative Liabilities, at Fair Value | (10) | (11)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 7 | 3
Price Risk Derivative Liabilities, at Fair Value | (10) | (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 | 569 |
Price Risk Derivative Liabilities, at Fair Value | (582) |
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 569 |
Price Risk Derivative Liabilities, at Fair Value | (582) |
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 | 36 | 4
Price Risk Derivative Liabilities, at Fair Value | (21) |
Commodity Derivatives - Power [Member] | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value | 1 | 1
Price Risk Derivative Liabilities, at Fair Value | (2) |
Commodity Derivatives - Power [Member] | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 4 | 2
Price Risk Derivative Liabilities, at Fair Value | (11) | (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 | 1
Price Risk Derivative Liabilities, at Fair Value | (2) |
Commodity Derivatives - Power [Member] | Level 1 | Future [Member] |  |
Price Risk Derivative Assets, at Fair Value | 4 | 2
Price Risk Derivative Liabilities, at Fair Value | (11) | (3)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 36 | 4
Price Risk Derivative Liabilities, at Fair Value | (21) |
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member] |  |
Price Risk Derivative Assets, at Fair Value | 0 | 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 | 384 | 127
Price Risk Derivative Liabilities, at Fair Value | (364) | (227)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member] |  |
Price Risk Derivative Assets, at Fair Value | 384 | 127
Price Risk Derivative Liabilities, at Fair Value | (364) | (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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