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Estimates (Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Commodity derivatives: | $ 384 | $ 560
Other Assets, Fair Value Disclosure | 31 | 26
Total assets | 415 | 586
Interest rate derivatives | (399) | (163)
Commodity derivatives: | (389) | (583)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 788 | 746
Level 1 [Member] |  |
Commodity derivatives: | 369 | 448
Other Assets, Fair Value Disclosure | 20 | 17
Total assets | 389 | 465
Interest rate derivatives | 0 | 0
Commodity derivatives: | (383) | (480)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 383 | 480
Level 2 [Member] |  |
Commodity derivatives: | 15 | 112
Other Assets, Fair Value Disclosure | 11 | 9
Total assets | 26 | 121
Interest rate derivatives | (399) | (163)
Commodity derivatives: | (6) | (103)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 405 | 266
Commodity Derivatives - Power [Member] | Options - Calls [Member] |  |
Commodity derivatives: | 1 | 1
Commodity Derivatives - Power [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 11 | 48
Commodity derivatives: | (5) | (42)
Commodity Derivatives - Power [Member] | Future [Member] |  |
Commodity derivatives: | 4 | 1
Commodity derivatives: | (3) | (1)
Commodity Derivatives - Power [Member] | Options - Puts [Member] |  |
Commodity derivatives: | 1 |
Commodity Derivatives - Power [Member] | Level 1 [Member] | Options - Calls [Member] |  |
Commodity derivatives: | 1 | 1
Commodity Derivatives - Power [Member] | Level 1 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: | 0 | 0
Commodity Derivatives - Power [Member] | Level 1 [Member] | Future [Member] |  |
Commodity derivatives: | 4 | 1
Commodity derivatives: | (3) | (1)
Commodity Derivatives - Power [Member] | Level 1 [Member] | Options - Puts [Member] |  |
Commodity derivatives: | 1 |
Commodity Derivatives - Power [Member] | Level 2 [Member] | Options - Calls [Member] |  |
Commodity derivatives: | 0 | 0
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 11 | 48
Commodity derivatives: | (5) | (42)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: | 0 | 0
Commodity Derivatives - Power [Member] | Level 2 [Member] | Options - Puts [Member] |  |
Commodity derivatives: | 0 |
Commodity Derivatives - Refined Products [Member] | Future [Member] |  |
Commodity derivatives: | 8 | 7
Commodity derivatives: | (10) | (15)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member] |  |
Commodity derivatives: | 8 | 7
Commodity derivatives: | (10) | (15)
Commodity Derivatives - Refined Products [Member] | Level 2 [Member] | Future [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: | 0 | 0
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 13 | 1
Commodity Derivatives - Crude [Member] | Future [Member] |  |
Commodity derivatives: |  | (61)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 13 | 1
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Future [Member] |  |
Commodity derivatives: |  | (61)
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 0 | 0
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Future [Member] |  |
Commodity derivatives: |  | 0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member] |  |
Commodity derivatives: | 17 | 42
Commodity derivatives: | (49) | (91)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Commodity derivatives: | 1 | 52
Commodity derivatives: | (1) | (40)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Commodity derivatives: | 65 | 97
Commodity derivatives: | (43) | (88)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member] |  |
Commodity derivatives: |  | (21)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Commodity derivatives: | 3 | 20
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member] |  |
Commodity derivatives: | 17 | 42
Commodity derivatives: | (49) | (91)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member] |  |
Commodity derivatives: | 0 | 8
Commodity derivatives: | 0 | 0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member] |  |
Commodity derivatives: | 65 | 97
Commodity derivatives: | (43) | (88)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Contracts [Member] |  |
Commodity derivatives: |  | 0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Swaps [Member] |  |
Commodity derivatives: | 0 | 0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Basis Swaps IFERC NYMEX [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: | 0 | 0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Swing Swaps IFERC [Member] |  |
Commodity derivatives: | 1 | 44
Commodity derivatives: | (1) | (40)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Fixed Swaps/Futures [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: | 0 | 0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Contracts [Member] |  |
Commodity derivatives: |  | (21)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member] |  |
Commodity derivatives: | 3 | 20
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 260 | 291
Commodity derivatives: | (278) | (224)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 260 | 291
Commodity derivatives: | (278) | (224)
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: | $ 0 | $ 0

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