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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, 2022
Dec. 31, 2021
Commodity derivatives: $ 688 $ 272
Other Assets, Fair Value Disclosure 27 39
Total assets 715 311
Interest rate derivatives (23) (387)
Commodity derivatives: (526) (211)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (549) (598)
Level 1 [Member]    
Commodity derivatives: 626 248
Other Assets, Fair Value Disclosure 18 26
Total assets 644 274
Interest rate derivatives 0 0
Commodity derivatives: (473) (190)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (473) (190)
Level 2 [Member]    
Commodity derivatives: 62 24
Other Assets, Fair Value Disclosure 9 13
Total assets 71 37
Interest rate derivatives (23) (387)
Commodity derivatives: (53) (21)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (76) (408)
Commodity Derivatives - Power [Member] | Forwards Swaps [Member]    
Commodity derivatives: 52 17
Commodity derivatives: (51) (15)
Commodity Derivatives - Power [Member] | Future [Member]    
Commodity derivatives: 3 6
Commodity derivatives: (3) (4)
Commodity Derivatives - Power [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0
Commodity Derivatives - Power [Member] | Level 1 [Member] | Future [Member]    
Commodity derivatives: 3 6
Commodity derivatives: (3) (4)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 52 17
Commodity derivatives: (51) (15)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Commodity derivatives: 20 3
Commodity derivatives: (59) (18)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member]    
Commodity derivatives: 20 3
Commodity derivatives: (59) (18)
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: 38 16
Commodity derivatives: (12) (3)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 38 16
Commodity derivatives: (12) (3)
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 60 7
Commodity derivatives: (25) (10)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 75 38
Commodity derivatives: (12) (6)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Commodity derivatives: 113 26
Commodity derivatives: (4) (9)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]    
Commodity derivatives: (2) (6)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]    
Commodity derivatives: 10 7
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 60 7
Commodity derivatives: (25) (10)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 75 38
Commodity derivatives: (12) (6)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member]    
Commodity derivatives: 113 26
Commodity derivatives: (4) (9)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Contracts [Member]    
Commodity derivatives: 0 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
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
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) (6)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member]    
Commodity derivatives: 10 7
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member]    
Commodity derivatives: 317 152
Commodity derivatives: (358) (140)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 317 152
Commodity derivatives: (358) (140)
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity derivatives: $ 0 $ 0