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Estimates (Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Commodity derivatives: | $ 560 | $ 321
Other Assets, Fair Value Disclosure | 26 | 21
Total assets | 586 | 342
Interest rate derivatives | (163) | (219)
Commodity derivatives: | (583) | (341)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 746 | 560
Level 1 [Member] |  |
Commodity derivatives: | 448 | 277
Other Assets, Fair Value Disclosure | 17 | 14
Total assets | 465 | 291
Interest rate derivatives | 0 | 0
Commodity derivatives: | (480) | (303)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 480 | 303
Level 2 [Member] |  |
Commodity derivatives: | 112 | 44
Other Assets, Fair Value Disclosure | 9 | 7
Total assets | 121 | 51
Interest rate derivatives | (163) | (219)
Commodity derivatives: | (103) | (38)
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 266 | 257
Commodity Derivatives - Power [Member] | Options - Calls [Member] |  |
Commodity derivatives: | 1 |
Commodity Derivatives - Power [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 48 | 23
Commodity derivatives: | (42) | (22)
Commodity Derivatives - Power [Member] | Future [Member] |  |
Commodity derivatives: | 1 |
Commodity derivatives: | (1) |
Commodity Derivatives - Power [Member] | Level 1 [Member] | Options - Calls [Member] |  |
Commodity derivatives: | 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: | 1 |
Commodity derivatives: | (1) |
Commodity Derivatives - Power [Member] | Level 2 [Member] | Options - Calls [Member] |  |
Commodity derivatives: | 0 |
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 48 | 23
Commodity derivatives: | (42) | (22)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member] |  |
Commodity derivatives: | 0 |
Commodity derivatives: | 0 |
Commodity Derivatives - Refined Products [Member] | Future [Member] |  |
Commodity derivatives: | 7 | 1
Commodity derivatives: | (15) | (28)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member] |  |
Commodity derivatives: | 7 | 1
Commodity derivatives: | (15) | (28)
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: | 1 | 2
Commodity derivatives: |  | (6)
Commodity Derivatives - Crude [Member] | Future [Member] |  |
Commodity derivatives: |  | 2
Commodity derivatives: | (61) | (1)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 1 | 2
Commodity derivatives: |  | (6)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Future [Member] |  |
Commodity derivatives: |  | 2
Commodity derivatives: | (61) | (1)
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: |  | 0
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Future [Member] |  |
Commodity derivatives: |  | 0
Commodity derivatives: | 0 | 0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member] |  |
Commodity derivatives: | 42 | 11
Commodity derivatives: | (91) | (24)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member] |  |
Commodity derivatives: | 52 | 13
Commodity derivatives: | (40) | (15)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member] |  |
Commodity derivatives: | 97 | 70
Commodity derivatives: | (88) | (57)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member] |  |
Commodity derivatives: |  | (2)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member] |  |
Commodity derivatives: | 20 | 8
Commodity derivatives: | (21) |
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member] |  |
Commodity derivatives: | 42 | 11
Commodity derivatives: | (91) | (24)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member] |  |
Commodity derivatives: | 8 | 0
Commodity derivatives: | 0 | (1)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member] |  |
Commodity derivatives: | 97 | 70
Commodity derivatives: | (88) | (57)
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: | 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: | 44 | 13
Commodity derivatives: | (40) | (14)
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: |  | (2)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member] |  |
Commodity derivatives: | 20 | 8
Commodity derivatives: | (21) |
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 291 | 191
Commodity derivatives: | (224) | (186)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 291 | 191
Commodity derivatives: | (224) | (186)
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member] |  |
Commodity derivatives: | 0 | 0
Commodity derivatives: | $ 0 | $ 0

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